In all he has won 23 major honours at United and is aiming to make it a 12thleague title and third Champions League this season, insisting he is hungrier than ever for more success.
He told the Manchester Evening News: "Probably, but I don't know when," he said. "People make a lot of the fact I've been at the same club for 19-20 years. If a young player comes into a team a big club, Liverpool, Chelsea, United, Arsenal and stays in the team then maybe.
"I've been at the club during its most successful era and been here a long time. It's going to be hard to beat. I'm not going to say it will never ever be done, but it will be tough."