Jonny Wilkinson says he feels as fit as a 20-year-old and has pledged to be back at his best when he resumes his career with Toulon next season. The England fly-half will join the French club on a two-year deal after undergoing detailed medical checks to prove his fitness.

Wilkinson has suffered a succession of injuries since kicking the winning drop-goal for England against Australia in the 2003 World Cup final. He has been sidelined for six months after dislocating his left kneecap during a club match with Newcastle Falcons.

"I need to play competitive rugby to settle the last few details in my game but, right now, I am 30 and I feel like 20," he said. "My knee is perfect, there is no problem."

Although his last injury prevented him from taking part in this summer's British and Irish Lions tour of South Africa, Wilkinson said it could help him become an even better player.

"I've had plenty of extra months to get myself ready and to take the time to make sure I am as fit as I could possibly be," he said. "I have no doubt that when I come back I'll be absolutely ready to go and I'll be a better player for the time I have had away and for the opportunity I have had to learn, to think a bit more and to get an idea of where I want to go with my rugby."

Wilkinson said his move from England to France was not all about money. As well as Wilkinson, Toulon have signed the Argentina fly-half Felipe Contepomi and the Scotland wing cum full-back Rory Lamont for next season. They will be coached by the former France international Philippe Saint-André while the former New Zealand captain Tana Umaga is in charge of the backs.

"It has been an easy decision to make as there is everything here – the environment, the staff, the players – to be successful," Wilkinson added. "I can contribute to the club but I also still have a lot to learn as my goal has always been to improve and to win."