Top 4 central defenders Manchester United could sign in January

#2 Kalidou Koulibaly

Highly regarded and much-coveted all over Europe, Kalidou Koulibaly is the sort of player that makes all those around him instantly better. The 27-year-old Senegalese has been the rock at the back of a fantastic Napoli side since 2014, a side that was unlucky not to win the league under Maurizio Sarri. Fantastic in the air and with the ball at his feet, the former Metz and Genk man is the kind of player that can walk into any team regardless of their style of play. He is never afraid to go in for a challenge or make an excellent interception or block. His game reading is fantastic and he is at a point in his career where he is reliable having ironed out childish errors.

The young defenders at Old Trafford could learn plenty from this man. Having recently penned a new 5-year deal in Naples, it is reported all suitors would have to fork out up to £90 million for him.