#2 Kalidou Koulibaly (Napoli)
The French-born Senegalese international, Kalidou Koulibaly, is among the best centre-backs in the world right now, and has played a vital role in Napoli's success in recent years.
The 27-year-old is among the best ball-playing defenders in the world, and has completed 876 passes this season with an accuracy of 89.5 percent. He does not rush into tackles, and always keeps his calm during crucial moments, which makes him difficult to beat in one on one situations.
The former Genk defender has played 137 games for the Naples outfit thus far, scoring 8 times. He was a part of the Serie A Team of the Season in 2015-16 and 2016-17, and also earned himself a place in the CAF Team of the Year in 2016, after his fine defensive showings.
Koulibaly has been linked with Real Madrid in recent weeks, and we might see him replacing Sergio Ramos in the future.