Fedele has now offered his take on the prospect of the Senegal international swapping Naples for west London.
"Koulibaly at Chelsea? It depends on the offer," Fedele told Italian outlet Tutto Mercato Web.
"No player is non-transferable, I say this as an agent, if an indecent offer arrives."
Chelsea transfer news: Kalidou Koulibaly claim made by Enrico Fedele (Image: GETTY)
Chelsea transfer news: Kalidou Koulibaly could join Maurizio Sarri at Stamford Bridge (Image: GETTY)
Invalid email
We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. Read our Privacy Policy
Fedele also discussed the possibility of Sarri rocking up at Stamford Bridge in the wake of his Stadio San Paolo exit.
"Chelsea? I see Sarri well," said Fedele.
"Chelsea no longer wants to invest in the market, but on the game.
Napoli's Koulibaly shows off fancy footwork against SPAL
"The Blues were attracted to Sarri football.
"But there is a need for time and I would not want the rush to be a bad councillor."
Sarri is said to be considering moves for Napoli quartet Elseid Hysaj, Raul Albiol, Piotr Zielinski and Jorginho too if he takes charge at Chelsea.