Mats Hummels, Borussia Dortmund
The World Cup winner is apparently United’s number one transfer target, according to the Metro.
Another centre back who could come in to shore up the leaky defence, Hummels is also comfortable with the ball at his feet. This would make him perfect for the playing style van Gaal is enforcing. At 25, he would be another long term option, and the Old Trafford hierarchy are willing to part with up to £40 million to get their man.