5 players Chelsea should target this summer

#4 Kalidou Koulibaly (Napoli)

Koulibaly has played 40 times in all competitions this season

Chelsea's defensive woes have been exposed this season and the club needs to examine how to improve the backline. Getting Koulibaly may be the answer to Chelsea's problems.

The defender stands tall and is quick, too. The Blues are in need of the player who can bring stability and assurance to the backline. Koulibaly has played over 100 times since joining Napoli in 2015.

Given his stature, he can offer a threat in the opponent's box when it comes to set-pieces. Koulibaly is also targeted by Premier League rival, Arsenal, as a long-term replacement for retiring Per Mertesacker. However, the Gunners are unlikely to be willing to spend as much as Chelsea for defenders. This gives Chelsea the edge to sign the player from Napoli.