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#4 Kalidou Koulibaly
Napoli's Kalidou Koulibaly is a defender who can be talked about in the same breath as some of the best defenders in world football, currently. The Senegalese defender is strong and quick, and is a leader at the back, and has been a solid presence at the back of the Italian club.
His upturn in form has coincided with three consecutive second place finishes for the Italian club in Serie A, in the previous three seasons.
Madrid's central defensive pairing of Sergio Ramos and Raphael Varane have formed a formidable partnership over the last few years, but have looked vulnerable at the back this season, notably in Madrid's two big losses against Barcelona and Eibar.
Koulibaly would not come at a cheap price as Napoli chairman Aurelio De Laurentiis admitted that they rejected a £95 million offer from Manchester United in the summer, and a fee higher than that can be expected as transfer fees in January are inflated.
