#4 Mauricio Pochettino
It's unlikely, but Gary Neville says he's a perfect fit. The Old Trafford job is very alluring and could tempt any able manager to take up the challenge.
Mauricio Pochettino is United's best case scenario but having developed such an interesting project at Spurs it is unlikely that he would sign for United but it's football, isn't it? Anything can happen.
Pochettino is a masterful tactician, he brings the team together as a unit, develops young players the right way and strikes the balance between an organized defence and a lethal attack.
Pochettino has all the tools to make it big in the Premier League and many have argued that he hasn't been given the resources financially to thrive as a manager. At Manchester United, he will have a huge budget at his disposal and can potentially win a lot of trophies. But then again this is all hypothetical.