Manchester United manager Sir Alex Ferguson says he intends to remain at the club as long as he remains healthy.

At 68, he is heading into his 24th season at Old Trafford where he has won 11 Premier League titles and two European titles. The short-term aim is to wrest the crown back from Chelsea after they edged his side at the post last season.

He said: "A lot of factors come into most important things. I'm at the right club, it's a fantastic club, it demands a challenge all the time. Every day, every year there's the challenge of being at the top and that helps me. I think you need good natural energy and I've been blessed with that.

I'm at the right club, it's a fantastic club, it demands a challenge all the time. Every day, every year there's the challenge of being at the top and that helps me.
Manchester United manager Sir Alex Ferguson

"I'm very fortunate about that so I'll keep going as long as my health keeps going. The same applies to every person. I'm 68 and so far my health's been standing up. If I have my health I can carry on. There will be a point when I do quit but I have absolutely no idea when that is.

"I tried that a few years ago and it was an absolute disaster. Agony. My wife made me change my mind and she was dead right. I think she was soon fed up with me in the house. Now when the time comes I think the club should be okay."