#3 Nikola Milenković
Milenković is currently being touted as one of the best young central defenders in Europe, if not the world today. He has all the attributes that make him one that can thrive in the Manchester United back line.
Nikola Milenković is strong in the tackle, can command the area around him quite well and he also has good speed. With all these attributes combined, if Manchester United can go ahead and get him, he'd surely be a great asset for them.
Currently, the team only has one central defender that they can truly rely on and Nikola Milenković, with all his great features, can provide them with a long term solution in that backline as he's still young.
At only 21-years-old, the young Serbian will surely be seen by most of the United faithful as Nemanja Vidic's replacement. And the fans have surely cried out for a defender in that mould since Vidic left the club.