Bruno Satin says the Senegal international can still improve.
“A player can always improve," Satin told Radio Kiss Kiss.
“Kalidou has already reached a good level, but he can get stronger in the air to become even more dominant in future."
On Napoli's form slump, he added: “There's no need to be dramatic, as a slight drop in form and an increase in fatigue can happen over the course of a season. Admittedly, the Europa League draw with RB Leipzig is by no means a simple one."