Napoli missed the chance to return to the top of Serie A after a 2-0 defeat by Bologna.
Netherlands forward Thijs Dallinga opened the scoring with a neat finish at the front post.
The hosts doubled their through Colombia defender Jhon Lucumi, who headed in a fine cross from Emil Holm.
Napoli’s defeat means Antonio Conte’s side are without a win in their past three matches in all competitions.
They entered the weekend top of Serie A but were dislodged by AC Milan’s 2-2 draw with Parma on Saturday, when Massimiliano Allegri’s side threw away a two-goal lead.
Napoli’s draw means they remain behind AC Milan on goal difference, and Inter Milan can leapfrog both sides with at least a point against Lazio later on Sunday.
