The Greek defender has forged a partnership with the Senegal international since moving to Naples last summer
Kostas Manolas has described his Napoli teammate and fellow centre-back Kalidou Koulibaly as "extraordinary".
The Greek defender moved to San Paolo last summer after five years with Roma.
Both men have 34 combined appearances in Serie A this season.
"I saw him even before I arrived [Napoli] and he was extraordinary," Manolas told Radio Kiss Kiss as per TuttoMercato.
The partnership of Koulibaly and Manolas has been hindered by injury, especially for the latter who has been out with a thigh problem since Mid-February, added to a muscle injury that kept him out for much of January.