Napoli postponed Juventus’s march to the Serie A title and consigned Chievo to relegation with a 3-1 win at the Stadio Bentegodi late on Sunday.
Carlo Ancelotti’s side needed a victory to ensure that the Turin club, who lost 2-1 at SPAL on Saturday, would not wrap up their eighth consecutive league championship with a record six games to spare.
The result leaves second-placed Napoli on 67 points, 17 behind runaway leaders Juventus on 84.
Juve can secure the title by avoiding defeat at home to Fiorentina next weekend.
Napoli were in poor form going into the game, having lost their Europa League quarter-final first leg against Arsenal 2-0 in London last week on the back of a draw against Genoa and defeat to Empoli in Serie A.