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The Senegal international is set to leave the Stadio Maradona after eight years, joining the Blues on a €38m deal plus add-ons.
According to multiple reports in Italy, the two clubs are expected to finalise the agreement today.
Koulibaly was Juventus’ main target to replace Giorgio Chiellini and, potentially, Matthijs de Ligt, but the Old Lady will be looking elsewhere now.
Meantime, Paulo Dybala is waiting for a new offer and is training at his home in Turin. Koulibaly’s move to Chelsea could help Napoli afford the striker’s salary.
Inter have offered him €7m plus add-ons but can’t finalise his signature until at least two strikers leave.
La Joya is an option for Roma to replace Nicolò Zaniolo who was omitted from the Giallorossi’s XI for their first summer friendly against Sunderland.