First-half goals from Miralem Pjanic and Emre Can rendered Jose Callejón’s effort a mere consolation as the Old Lady ended a six-game unbeaten run of the Naples outfit.
The Senegal international who made his 24th league appearance in the encounter featured for the entire duration but could not save his side from avoiding defeat.
Following the loss, the former Genk player has called on his side to move on and continue their quest to finish well at the end of the season.
“Difficult to comment [on the] defeat but that will make us grow a lot. We are a team of great quality, we must not quit,” Koulibaly tweeted.
Sconfitta difficile da commentare ma che ci farà crescere tantissimo. Siamo una squadra di grande qualità: non dobbiamo mollare.— Koulibaly Kalidou (@kkoulibaly26) March 3, 2019
🇮🇹 #NapoliJuve 1-2 #SerieA
🇸🇳 #KK26 #famiglia
💪🏿 #DifendoLaCittà pic.twitter.com/JBlOdMUDIO
Despite the defeat, Napoli remain in the second spot after garnering 56 points - 16 points adrift of leaders Juventus - from 26 games.
Koulibaly will hope to help his side bounce back to winning ways when they play host to Red Bull Salzburg in Thursday Europa League game.