Manchester United boss Sir Alex Ferguson says there's no point talking about his successor.

Ferguson was asked about Inter Milan boss Jose Mourinho succeeding him at Old Trafford.

He told the Mail on Sunday: "I remember Ray Wilkins managing Queens Park Rangers and I asked him if he wanted to do the Wolves job, which I'd been told was available.

"He said No, and I responded: 'Wolves, it is a fantastic job.'

"He said: 'No, I promised the chairman of Queens Park Rangers I would stay for two years.' Then he got sacked the next year.

"The point is, you can talk about the successful managers right now who might be on everyone's list. But in two years, they may not be. Or even next year.

"So it's very difficult to say who would replace me when my time came.

"Manchester United would need somebody successful for that kind of job. Most clubs would look for the most successful manager on the horizon. But two years ahead, they may not be successful any more.

"It is a horrible game, a results industry and, as Roberto Mancini says, you can lose three games in Italy and get sacked. We're getting a little bit like that ourselves. You think of Peter Reid, Ruud Gullit and Bobby Robson at Newcastle, sacked just into the new season.

"When you stoop to that level you have absolutely no idea how to run a football club."