2) Mats Hummels (Borussia Dortmund)
One of the best defenders in the world, Borussia Dortmund star Mats Hummels is another big name linked with Arsenal at times this season, though Manchester United are perhaps the favourites to land him. Still, if Arsene Wenger is serious about winning the title he needs a better defence and there are few better than the rock-solid German international.