Manchester United’s new defence: Louis van Gaal to sign entire back four in Janauary

2) Neven Subotic (Borussia Dortmund)

The Daily Express has also linked United with a move for Borussia Dortmund centre-back Neven Subotic. United have long been linked with his team-mate Mats Hummels, but could now switch their focus to the solid Serbian.