86 min: Leeds substitution Sean Longstaff replaces Brenden Aaronson.

85 min Nmecha overruns the ball, wins it on the stretch but then follows through into Caicedo’s ankle. He’s booked.

83 min Nmecha dances between two Chelsea players and gives the ball to Stach, who shoots over from 25 yards. Worth a try when you have a sweet spot on your right foot as Stach does.

80 min Chelsea have kept Leeds at arms’ length in the last 10-15 minutes. Games change in a split second, but right now an equaliser doesn’t look especially likely.

79 min “They may never have met in an FA Cup Final, but there’s still something depressingly ’Not The Magic Of The Cup’ about potentially seeing City and Chelsea,” writes Matt Dony. “The team who brought billionaire-owners-buying-the-title to the masses, vs the team who perfected it. Beautiful stuff. Can they both lose? (Yes, from a bitter Liverpool fan.)”

78 min Ampadu joins him in the book for a trip on Pedro Neto. He’s been really good today, Neto.

78 min Palmer is booked for delaying a Leeds restart.

78 min “Could they try rolling subs for keepers?” wonders Dan Christmas. “Keeper goes down, get him off the pitch asap and if your sub keeper isn’t in goal within a minute you have to put an outfield player in. Then the ‘injured’ keeper has to stay off for a bit, but can swap back with the sub. Too complex?”

Way too complex, I fear. And imagine the tedious outrage from managers and players.

77 min Leeds have been the better team in the second half – not by much, but enough to ensure nobody connected with Chelsea will feel safe while it’s 1-0.

76 min Struijk is booked for a clear tactical foul on Joao Pedro.

75 min Chelsea and Manchester City have never met in an FA Cup final. Nor have Leeds and City for that matter. But there have been other finals between Chelsea and City – in the League Cup in 2019, when Kepa refused to be substituted before a penalty competition, and a nine-goal thriller in the Full Members’ Cup in 1986.

74 min: Double substitution for Leeds Lukas Nmecha and Willy Gnonto replace Ao Tanaka and Noah Okafor.

71 min: Chelsea substitution Cole Palmer replaces Alejandro Garnacho, who was handled excellently by Jayden Bogle.

70 min Okafor is back on the field, possibly after a pickle juice chaser or two.

69 min That Calvert-Lewin chance (58 min) was better than I realised at the time, certainly for a player of his quality. He strained his neck muscles to put enough power on the header but it swerved straight into the hands of Sanchez.

I guess sometimes, when a centre-forward has only a split-second in which to calculate everything, they concentrate on generating power and don’t have enough bandwidth to place the header as well.

As if I’d know!

68 min Okafor is down with what looks like cramp. It’s a very hot day at Wembley and he has, in the parlance of our times, put a shift in.

67 min “The sooner the laws are changed so that an outfield player has to leave the pitch when a goalie receives treatment, the better,” says Andrew Goudie.

I like the idea in principle, because these goalkeeper timeouts are immensely annoying, but how would you decide which player? Teams could waste even more time deciding who take off!

66 min: Chelsea substitution Andrey Santos replaces Romeo Lavia, who was quietly excellent in the first half but doesn’t have enough miles in his legs to play the full game.

65 min Gudmundsson’s cross is cleared to the edge of the area, where Tanaka shanks a volley well wide. He couldn’t sort his feet out in time, but it was half a chance and he threw his head back in disappointment at his own technical deficiency.

62 min Stach curls the free-kick wide of the near post. He was trying to catch Sanchez with a surprise shot from a narrow angle, but he couldn’t get it round the wall and on target.

61 min It briefly threatens to kick off near the touchline, between both the players and backroom staff, before everyone returns to their usual positions.

Whether Sanchez is cheating or not, we know goalkeepers do it all the time and it’s becoming a big problem.

60 min Caicedo is booked for fouling Stach just outside the area on the right. Sanchez goes down before the free-kick can be taken, and all connected with Leeds think it’s a tactical timeout. He didn’t look in agony as he sat down.

58 min The dangerous Okafor cuts inside from the left and clips a flat cross towards the far post. Calvert-Lewin rises imperiously but his header is too close to Sanchez. Not an easy chance, even for him, but it was a chance.

57 min Enzo swings the corner onto the roof of the net.

56 min Joao Pedro and Enzo combine to find Garnacho, whose shot deflects behind for a corner. It’s been a fun, end-to-end second half so far.

54 min Leeds are furious when Gusto isn’t penalised for obstruction near his own byline. He was on all fours at one point, then I think he had the ball wedged behind his legs. All the while Aaronson, Okafor and another Leeds player were snapping around him.

53 min Leeds have been miles better since half-time, particularly in possession.

52 min “On the international feed, they showed the Leeds subs playing a rondo,” writes Kári Tulinius. “They seemed in very good spirits and were having fun. Were I in a cup semifinal, I’d be petrified with stress during half-time. If Leeds play the second with anything approaching that joie de vivre, they’ll have a good chance of winning.”

50 min Okafor surges thrillingly down the left only to get too much elevation on his cross. Not even a leaping Calvert-Lewin could reach it.

48 min Chelsea almost score a memorable team goal. Neto finds the underlapping Gusto, who sits a defender down with a Cruyffish turn and slides the ball back to Fernandez on the edge of the area. He flicks it behind his standing leg to Joao Pedro, eight yards from goal, but he takes too long and is eventually crowded out.

With a couple of Leeds defenders around, Joao Pedro wanted to work some space for a clearer shot at goal. On reflection he should have just leathered it.

46 min Leeds begin the second half. These are the revised teams.

Chelsea (4-2-3-1) Sanchez; Gusto, Chalobah, Tosin, Cucurella; Lavia, Caicedo; Neto, Enzo Fernandez, Garnacho; Joao Pedro.

Leeds (4-2-3-1) Perri; Bogle, Rodon, Struijk, Gudmundsson; Stach, Ampadu; Aaronson, Tanaka, Okafor; Calvert-Lewin.

Leeds manager Daniel Farke has made a double substitution at half-time. Joe Rodon and Anton Stach replace James Justin and Jaka Bijol, which means a switch to 4-2-3-1.

Half-time reading

45 min Four minutes of added time.

44 min Leeds are having a better spell as half-time approaches, at least in terms of possession. Now they need some penetration.

42 min A long throw from Ampadu is headed up in the air once and then twice before the ball bounces towards Okafor. He shoots over from 15 yards, a tough chance as it didn’t come down as quickly as he wanted.

39 min Bogle nutmegs Cucurella and moves into the area. He’s tackled by Chalobah but Aaronson wins a corner for Leeds. Tanaka takes and it’s headed away, I think by Chalobah.

36 min Garnacho, down and apparently in need of treatment, suddenly springs to his feet to receive a pass on the left side of the area. He does Bogle with a nice chop outside and blasts a low ball right across the face of goal.

35 min Okafor collects a loose touch from Joao Pedro and drives a low shot from 20 yards that is blocked by Chalobah.

Leeds would probably take this scoreline at half-time, because apart from the Aaronson chance they’ve been second best. As Steven Gerrard says on TNT Sports, they are being outnumbered and overrun in midfield.

30 min A chest-volley from Joao Pedro on the edge of the area fades a few yarsd wide of the far post. He’s been outstanding. I’m sure Chelsea would have played better today anyway, caretaker-manager bounce and all that, but Joao Pedro’s intelligence, movement and deftness of touch make a big difference. He’s the rug that ties the room together.

28 min Nothing much is happening in the game just now.

I wish somebody would pull my hair, mainly because it would mean I had some.

27 min “Nearly half an hour gone in a Chelsea v Leeds FA Cup game,” says Justin Kavanagh, “and we’ve not seen a serious reducer, yellow card, nor a punch thrown. The game’s gone!”

26 min The two players were jockeying for position when Calvert-Lewin’s flailing hand briefly, very briefly, made contact with Cucurella’s hair. It’s been cleared by VAR, presumably because the contact was more even more fleeting than when Lisandro Martinez was sent off for pulling Calvert-Lewin’s hair.

Calvert-Lewin thus avoids becoming the answer to a very niche quiz question of the future.

25 min There’s a VAR check for a potential hairpull by Calvert-Lewin on Cucurella.

Pascal Struijk had a split-second brainfreeze, 40 yards from the Leeds goal, and was robbed by Joao Pedro. He made ground and played the ball outside to Pedro Neto on the right. Neto stood up an excellent cross and Enzo Fernandez arrived late to slam a downward header into the net. A really good goal.

He looks so sharp. A throw-in was partially cleared to Lavia. He wasted no time finding Fernandez, who cushioned a cute little pass into the area. Joao Pedro got to it first and hammered a left-foot shot from the angle. It beat Lucas Perri, hit the inside of the post and flashed across the face of goal.

20 min A few players Chelsea players appeal for handball when a hooked shot from Garnacho hits a Leeds defender in the area. No suggestion that it’s being checked by VAR.

19 min Chelsea are still dominating possession, but Leeds are growing into the game and they will always be a threat on the break.

17 min At the other end, Neto’s shot from the edge of the area is blocked after good play by Joao Pedro.

16 min Aaronson didn’t strike his shot with complete conviction, but it was still a pretty good effort that would have gone into the far corner but for Sanchez’s save.

12 min After more patient passing, Caicedo lofts a superb straight pass to release Garnacho on the left side of the area. He tries to control the ball with the outside of his right foot, takes a heavy touch and can’t keep the ball in play.

With a better first touch – he might have gone with his left foot – he’d have had a shooting chance.

11 min Chelsea have had 88% possession.

9 min Chelsea are having plenty of the ball, with Joao Pedro looking sharp on his return to the side. The approach is similar to the Maresca/Rosenior teams, lots of patient probing.

6 min Joao Pedro does really well to hold off a Leeds defender and head a long punt from Sanchez back to Enzo Fernandez. He blasts a shot from 25 yards that is comfortably held by Lucas Perri.

4 min Tanaka hits a poor free-kick over the bar.

2 min Gusto looks okay to continue, though he’ll have to serve his 30 seconds off the field when Leeds take the free-kick. It’s slightly to the left of centre, 20 yards from goal, with Tanaka and Gudmundsson over the ball…

1 min After 22 seconds, Okafor is fouled just outside the area by Caicedo. Chelsea have a problem with Gusto, who has stayed down after being challenged by Tanaka at the start of that Leeds attack.

1 min Chelsea kick off from right to left as we watch.

Enzo Fernandez and Ethan Ampadu lead their teams onto the field. It’s another gorgeous day at Wembley and the Leeds fans in particular are making a helluva racket.

Daniel Farke speaks to TNT Sports

[On Leeds playing their first FA Cup semi-final since 1987] We’re happy that we were able to give this gift to our fantastic supporters. It’s special and exciting but we are not just here to enjoy the moment – we want to be successful today. It’s a difficult game. But we know that at our best, we have a chance to reach the final.

[On Dominic Calvert-Lewin, who starts his FA Cup game of the season] He has played here several times for his country so he’s used to the stadium and the circumstances. I don’t just judge him on goalscoring. His workload is crucial, his link play and hold-up play.

Lucas Perri fully deserves to play. He has been fantastic during the cup run.

Chelsea have also been in WSL action today. You can read all about their game at Everton, plus the latest in the Scottish title race and more, with our clockwatch.

“I’ve been a Leeds fan since I was a nipper,” writes Jeremy Boyce, “and I’m old enough to remember the Trolleybuses on Briggate. As you say, Sir Don was manager last time we made it to an FA Cup final, but lest we forget, it ended, as did so many trophy campaigns under Revie, in disappointment, thanks to Sunderland’s Ian Porterfield’s goal and Jim Montgomery’s amazing double save.

“Since those halcyon Revie days we’ve had ups and downs (mostly downs) with occasional false dawns (Armfield, Wilkinson, O’Leary, El Loco), and I think I speak for Nasties fans everywhere when I say we were filled with dread for what this season back in the Promised Land might bring, more so in November when results were poor.

“As it turns out it’s been third promotion lucky for likeable Daniel Farke, so glad the board stuck with him. So we march on together up Wembley Way with a chance of a decent crack at staying up, and making our way to a fup final shellacking by relentless trophy winners Citeh.

“There’s surely not been a much better moment to be playing the Blues, let’s hope it’s them drowning their sorrows with Muddy Waters and whisky sour afterwards. Extra time? Penalties? I suspect this one will be done and dusted in 90 minutes plus stoppages (see Rochdale - York yesterday).”

Calum McFarlane’s pre-match thoughts

It’s been a difficult week. It’s never nice when a manager loses his job, but you have to be adapt and be ready for a big challenge like Leeds United in a semi-final.

We’ve tried to give the players what they need to be ready for this game – technically, tactically, psychologically. It’s about getting them in the right headspace, having a clear gameplan and hopefully executing it well.

[Do you see this as a showcase for you?] No, not really. It’s about doing a job for the club and the players; we’re here as interim staff to support them. If we can get a positive result today it will give us some momentum going into the last four Premier League games.

[Cole Palmer] was close to being fit enough to start but we decided it made more sense to have him on the bench.

The crate was crammed with bottles but Daniel Farke made light work of hoisting it on to a table and inviting everyone to help themselves. It was a little after 10.30 one night in April last year, an already-promoted Leeds had just beaten Bristol City, and the manager was offering journalists an end-of-season beer.

Such gestures are increasingly unusual in an ever-more corporate and sanitised sport, but Farke brings a human touch to proceedings. Indeed, his refreshingly down-to-earth approach is reminiscent of an illustrious title-winning predecessor. Behind a blunt exterior Howard Wilkinson was a caring manager who, spotting a journalist stranded outside Elland Road late one night, drove him home to Sheffield. It seems the sort of thing Farke might also do.

Coincidentally, Wilkinson and Farke are lovers of literary fiction who toyed with the idea of becoming novelists in their own right. While Wilkinson ultimately took a different path to his hero, DH Lawrence, Farke – a Gabriel García Márquez fan – wrote several chapters of a book before deeming it “crap” and shoving the manuscript in a drawer.

Today’s game is a repeat of the 1970 FA Cup final, when Chelsea pipped Leeds in a replay at Old Trafford. That game was among the filthiest known to mankind, and I urge you to relive it with Scott Murray’s retro MBM.

44 min: This is absolutely outrageous! Gray, back up, hobbles down the left. He doesn’t really want a pass from Giles, but gets one anyway. He goes to hoick the ball up the wing, away from personal danger, but it’s too late: Hutchinson comes sliding in, whipping Gray into the air like a greasy pancake. Recently injured, Gray understandably takes exception to this wild lunge. Less understandably, he responds by stamping on his assailant’s leg. Hutchinson springs up and punches Gray right on the tip of his front tail. Right in the trousers! Those are two sendings off, right there, though the referee does nothing whatsoever and play goes on.

Given Chelsea supporters are pining for the old days, perhaps they can cheer themselves up by remembering glorious runs from some of the club’s previous interim managers, although whether Calum McFarlane is capable of emulating the likes of Guus Hiddink, Roberto Di Matteo and Rafael Benítez looks like a long shot as another damaging week for the BlueCo project draws to a close.

Is this inexperienced young coach the man for a salvage operation? Fans will take some convincing after watching Chelsea’s players not so much throw in the towel as not even bother to pick it up at all during Tuesday’s defeat to Brighton, which saw off Liam Rosenior. Those heading to Wembley for Sunday’s FA Cup semi-final against Leeds will hope for a response but do not be surprised if they turn mutinous again.

It’s hard to believe this is Leeds’ first FA Cup semi-final since 1987, when they lost a thriller against Coventry. The last time they reached the final, Don Revie was manager.