#3 Mats Hummels
While the news of him 'almost' signing for Bayern Munich seeped through the world last week, Mats Hummels still remains a Borussia Dortmund player in search for a 'top club'. He has admitted in the past that he wouldn't be able to turn down a move to Barcelona.
The 27-year-old is, according to me, one of the better defenders Germany and the world has seen in a while. He showed against Liverpool that he's capable of running with the ball all the way till he finds a striker. His broad shouldered physique gives him the advantage of wrapping the ball away from most poachers.
Hummels also has an abundance of 'game sense'. He's capable of reading situations with ease and making the right call. With his moderate pace – enough for a central defender – and his intelligence, he would be an incredible addition to the Catalans who wouldn't have to pay too much for him given he's got one year left on his contract come the end of the current season.