Michael Ball has alleged Everton may have already agreed personal terms with Kalidou Koulibaly ahead of a potential huge move to Goodison Park.

Rafa Benitez is keen to be reunited with Koulibaly having managed the Senegal international central defender during his time in charge of Napoli.

While Benitez left the Italian club six years ago, Koulibaly is still on Napoli's books and made 37 appearances last season.

Benitez, who has already bolstered his squad by signing Andros Townsend, Asmir Begovic and Demarai Gray, could be frustrated in his efforts to sign Koulibaly as Napoli boss Luciano Spalletti has insisted Koulibaly is not for sale.

But, according to Calciomercato, that has not stopped Everton in their tracks. The report suggests Everton made an opening bid for the 30-year-old which has been rejected.

Former Toffees left-back Ball believes there is a deal to be done and would not be surprised if the Merseyside club have already had conversations with Koulibaly.

Speaking exclusively to The Transfer Tavern, he said: "Everton are in talks and they know what they need to pay.

"They probably know the wages and it has probably been verbally agreed. It's just whether they can actually finance the move and get it over the line."