Senegal defender Kalidou Koulibaly remains a firm target for English Premier League giants Chelsea, with Napoli looking to sell one of their top performers from the 2015-16 season.

Antonio Conte’s side made an original offer for the 25-year-old, but it was rejected by the Italian Serie A club, as they were looking for an offer in the region of £51.6 million, which would be a UK record transfer fee for Chelsea.

The London club is not willing to give up on the battle for the physically imposing Koulibaly, and with interest also emerging from Everton, they have decided to make an improved offer of £38 million for the centre back’s services. Napoli will need to weigh up the renewed offer for their star defender.

Kalidou Koulibaly (R) of SSC Napoli competes for the ball with Alvaro Morata (L) of Juventus FC during Serie A match . Photo by Marco Luzzani © Getty

Arsenal were also keen on Koulibaly during the current transfer window, but they soon dropped their interest as coach Arsene Wenger believed him to be overpriced.

Originally Koulibaly looked to remain at the Stadio San Paolo, but his salary demands could not be met by Napoli, and agent Bruno Satin has urged the Italians to consider completing the sale of his Senegalese client.

The former Racing Genk and Metz player was involved in 42 appearances for Napoli during the course of the last campaign, displaying his important contribution to their second-place finish in the Italian top flight.