Raphael Varane (Real Madrid, £22m)
Jonny Evans, Phil Jones, and Chris Smalling are all running out of time to prove themselves at Old Trafford. United appear to be near certainties to sign at least one new centre back in the summer transfer window, and the top target would likely be the Frenchman who Chelsea manager Jose Mourinho has described as the best young defender on the planet. The European champion is still only 21, and has bags of potential.