The 6ft. 5” Senegalese centre-back has emerged as a target for the Blues of late amid suggestions from his agent that he’s ready to “leave” Naples.
However, it’s reported that the Serie A runners-up are reluctant to let him move on.
It’s recently been claimed that the London club bid £38m for the powerful enforcer, with new manager Antonio Conte gearing up ahead of the coming season.
Although the offer has been knocked back, dialogue is believed to remain open between all the parties involved, although the chances of Koulibaly signing a new contract at the Stadio San Paolo are thought to be slim.
Chelsea are currently short of options at centre-back, with Kurt Zouma out of action with a long-term knee injury.