4) Nemanja Mati?
The Serbian enforcer was in hot demand in the summer. Widely expected to leave Benfica in the summer for Chelsea, incidentally the club who included him as a makeweight in the David Luiz deal, Mati? decided to stay on at the Estádio da Luz. Mati? is a mighty physical presence in the defensive midfielder position. He is very hard to get off the ball, and is also technically gifted. He is adept at making challenges, and, while no Claude Makélélé, possess a good sense of positioning. He is also devastating when he makes runs deep out of midfield. Mati? was one of the main reasons why Benfica reached the Europa League finals last season, and will not come cheap. United may have to cough-up in the excess of £35 million for the hard-man.