#2 Kalidou Koulibaly

Having signed with Napoli in 2014 as a 22-year-old, Kalidou Koulibaly has gone on to make over 100 appearances for the Naples club. He was able to break into the starting centre-back role and has ever since been a regular in the starting lineup.
He had also decided to represent Senegal instead of France - his country of birth - and has gone on to make 22 appearances for the national team.
The Senegalese international has a strong, commanding presence in defence and possesses qualities of playing the ball out of the back and making tackles as well winning the aerial battles.
He is also excellent with both feet. He was also previously linked with Chelsea, specifically in 2015.
No other club has so far expressed any major interest in Koulibaly and Chelsea should consider themselves as front-runners to his signature and he should available for a fee in the range of £40m-£60m.