#1 Kalidou Koulibaly

Koulibaly is recognised as one of the best defenders in the world. The Senegalese beast has formed a great defensive partnership with Raul Albiol in recent seasons at his present club Napoli. Former Napoli manager and the present Chelsea manager, Maurizio Sarri, has given him plaudits on multiple occasions for his top-class performances.
Koulibaly has made 13 appearances in the Serie A this season, with 1.8 tackles per game, 4.3 clearances per game and 0.8 blocks per game.
Koulibaly is a quick, strong and a versatile defender who’s a massive aerial threat when it comes to set-pieces and he’s also known for his ball-playing ability. No wonder he is rated among the best defenders in the world.
However, because of his world-class abilities, he might turn out to be a very expensive purchase for the Red Devils. There were a lot of transfer rumours coming out recently that he’d cost around 80 or 90 million pounds. Despite his cost, Koulibaly would, without any doubt, improve the Manchester United defence.