#2 Alex Sandro (Juventus)

Alex Sandro has emerged as one of the best left-backs in Europe. He was bought by Juventus in 2015 for €26 million. Since then, the Brazilian has played 319 club games and also has 10 international caps for Brazil.
Sandro has often been deployed as a wing-back and has proved that he possesses great offensive attributes. He is extremely fast, good with the ball and is also an excellent crosser of the ball- something lacking in Mourinho's current options. He will definitely bring a world of difference to United's back-line.
Sandro has been heavily linked with Manchester United and Chelsea in the last couple of transfer windows. There were even reports of a possible cash-plus-player deal for the player involving Matteo Darmian. The player will definitely won't come on the cheap as Juventus will not want to let go of him easily.
Video: