Manchester United are locked in talks with Napoli for Kalidou Koulibaly.

Sky Sports says United are big fans of the Napoli star as they strive to finally sign a new central defender.

Koulibaly is manager Jose Mourinho's top defensive target for the January transfer window.

It is said that senior United officials have already met with the Serie A club to discuss a potential deal when the market reopens.

And United have been told it'll cost over £90m to sign the 27-year-old Senegalese.