Napoli have officially signed Kalidou Koulibaly, plus renewed with Roberto Colombo and Giandomenico Mesto.
The Partenopei released a statement confirming the deal for the Genk centre-back, which had been done for at least a month.
“I am very happy to be playing for Napoli, an important club with a great project,” said the 23-year-old.
“I am ready for this adventure and I can’t wait to get started working with my new teammates so I can experience the San Paolo.”
Koulibaly signed a five-year contract with Napoli.
The club also announced it had renewed the contracts of goalkeeper Colombo and right-back Mesto.