4. Mats Hummels
The German international is regarded as one of the best centre-backs in the world at the moment. His presence in the Germany defence at the World Cup was one of the reasons Joachim Low’s men came back from Brazil victorious.
Hummels has also been excellent in a Borussia Dortmund shirt for a number of years. That is why the Bundesliga giants are so keen to hold on to the 25-year-old and it is also why Manchester United are so interested in signing him.
The Red Devils defence needs a complete overhaul and van Gaal knows Hummels would be exactly the type of man he could build his defence around. Again, United will have to offer a huge amount if they are to persuade Dortmund to part with one of their prized assets.