Napoli delayed Juventus' coronation as Serie A champions for another week at least as a goal in each half from Kalidou Koulibaly helped them to a 3-1 win at Chievo.
Chievo stand on the brink of relegation from Serie A following a 3-0 defeat at Bologna, who lifted themselves out of the bottom three.
Krzysztof Piatek's 57th-minute winner saw AC Milan beat Chievo to claim their fifth straight Serie A win.
Top scorer Mauro Icardi watched from the stands as Inter strengthened their grip on third place in Serie A with a 2-1 win over Sampdoria at San Siro.
Gervinho scored twice as Parma came back from 3-1 down to draw 3-3 at Serie A leaders Juventus on Saturday.
Lucas Piazon has completed a loan move from Chelsea to Italian side Chievo for the rest of the season.
©2019 Sky UK