Kalidou Koulibaly scored his first two goals of the season as Napoli beat Chievo to make Juventus wait another week at least to win the Serie A title.
The centre-back headed home Dries Mertens' corner to give Carlo Ancelotti's side the lead and Arkadiusz Milik drove in a second from 25 yards.
Koulibaly smashed home a third late on.
Chievo are relegated with the result, having won just one Serie A game all season, although Bostjan Cesar headed in a last-second consolation.
Juve, who lost 2-1 at SPAL on Saturday, will wrap up an eighth consecutive title if they get a point against Fiorentina at home next Saturday (17:00 BST).
The Turin side host Ajax in the Champions League on Tuesday, with Napoli at home against Arsenal in the Europa League on Thursday.