Manchester United legend Sir Bobby Charlton believes it might be a mistake to appoint someone from inside of the club's history to take over as manager.

Most United fans quite like the idea of a former player's Roy Keane and Mark Hughes taking over from Sir Alex Ferguson when he retires.

However, Sir Bobby believes it might turn out to be a mistake to appoint one of them instead of a complete 'outsider'.

"I think their have been a lot of mistakes made by a lot of clubs in getting managers who have already been some part of the club in their career," Charlton told The Daily Star .

"I don't buy that. If he's a good manager it doesn't matter who he is, where he comes from or even what nationality he is.

"In fact, in lots of cases, I'd say it was a hardship now to have a club background.

"People say only an old player could do it but maybe it's better to have a clean bill of health. Maybe give it to somebody who will really clear the decks."