CB: Phil Jones (£17 million from Blackburn Rovers)
Phil Jones still remains an enigma to most football fans. Every time he starts to show why Sir Alex had such a high opinion of him, he either gets injured or sustains a dip in form.
So far, this season has been one of his best in a red shirt. When he's fit, he's almost always a first choice, and for a notorious disciplinarian like Mourinho, that says a lot about his defensive abilities.
For all the internet memes and Facebook jokes, he's really matured as a defender under Mourinho. He's more composed on the ball and more assured going into a tackle. It also helps that he has a solid holding midfielder in Nemanja Matic playing in front of him, taking some of the burden off his shoulders.
The only issue remaining is his susceptibility to injuries. But given the fact that he's still only 25, he has plenty of time to work on his fitness and maybe he can eventually live up to SAF's predictions one day.