Chelsea and Manchester City are two examples of teams that have seen bids rejected and United have also failed in their search for the player in 2019.
Koulibaly’s long-term future remains uncertain, which the defender himself admitted during an interview with Gazetta dello Sport last year.
“In football, you never know what happens. I never talked to Napoli about leaving. If we have to find a solution, we will find it, but I never talked about the transfer market ”, he said.
“I also read about my future in the newspapers. But I just want to think about playing, I’m 100 percent [committed to] Napoli and it bothers me to be connected, every day, to this or that European club.
“We will see what the president (Aurelio De Laurentiis) will decide and if he proposes to extend my contract, that would allow me to end my career here.
At the moment, I still have a three-year contract and I’m not thinking about anything other than Napoli. “