The soon-to-be 39-year-old is currently out with a hand injury and admits he is close to retire from football.
“I’ve said for a few years that it sometimes may be my last season,” he told Sportsweek.
“Six months before my contract with Manchester United ended in December 2006, we extended for one year and so far it has been the same every time.
“I wait each season to see how or where I stand, if everyone is happy and if I can get motivated.
“But I know, because I always get older, it is increasingly likely that this will be my last season.
“In December, it will be clear how it goes. By then, I’ll have clarity. It is a horrible dilemma.
“On the one hand I do not oversleep, I feel as good as a few years ago.”
