#2 Kalidou Koulibaly
Chelsea have a lot of centre-backs in their squad despite Kurt Zouma being out on loan. But this summer, they need to start thinking about the future and not just next season.
Gary Cahill might be the club captain but he's nowhere near the quality they need in the starting XI. The £7 million bargain signing from Bolton has had his time and needs to be replaced.
Kalidou Koulibaly can be the perfect signing for The Blues. Alongside Christensen, they can be one of the meanest duos in the world and shut out opponents like Terry and Carvalho did during their prime at Stamford Bridge.
Edited by Arvind Sriram