Mats Hummels (Borussia Dortmund)
With Man United losing the services of Nemanja Vidic and Rio Ferdinand there is clearly a real need to bring in fresh central defensive options, not least as both Chris Smalling and Phil Jones arguably perform better in right-back and defensive midfield roles, and van Gaal will look to tempt the Borussia Dortmund defender to the Premier League this summer.
Having seen his Westfalenstadion side fall further behind domestic rivals Bayern Munich the rock solid defender could be ready for a fresh challenge.