Marcelo Bielsa.
Right, listen. I know what you're thinking: 'What?! Marcelo Bielsa?! The man who has never won a major trophy in over thirty years of management?! The guy who has just been sacked by Leeds United, a team in free fall having conceded 40 goals in just 12 games and looking likely for the drop?! The fella who sits on a bucket?! The manager so married to his style of football that he will never compromise regardless of the opposition he may face or the trouble his team might be in?! A former Leeds manager!?"
And yes, that's the right man. Some criticisms of him may well be justified but others are ignorant. Manchester United should, at the very least, consider what he could bring to the club. They might just be surprised.