In an interview with ITV Football earlier this season, Sir Alex Ferguson talked of his admiration for Madrid manager Jose Mourinho.
"I think a testimony to his work is that all of his players want to play for him and that's indicative of a really top manager," he said.
"I would never think a guy who hadn't played the game could be a top coach - but I think you've got to look at his personality.
"He's got a marvellous, strong personality and I think that bridges that gap.
"He's won two European trophies, he's won UEFA, he's won the leagues - he's done it all, so there's absolutely no weakness there," he added.