Napoli president Aurelio de Laurentiis was delighted with victory at Juventus.
Napoli now trail Serie A leaders Juve by one point after their 1-0 win in Turin.
De Laurentiis took to social media to declare: "Happy for a victory of great prestige.
"Congratulations to all, no one excluded."
Kalidou Koulibaly headed home the winner to set up an exciting season finish with four games to go.