Carlo Ancelotti believes that Kalidou Koulibaly will not leave Napoli this summer.

The centre-back is a key target for teams such as Manchester United, Chelsea and Real Madrid.

But the Senegalese defender, who is valued at more than £130 million, is someone who Napoli consider non transferable.

And their Italian manager said of the situation to reporters on Thursday: "Napoli will not be forced to sell.

"Koulibaly will not leave here."

Interested teams may have to turn elsewhere in their pursuit of a world class central defender.