Marko Arnautovic's first league goal of the season has given Inter Milan a 2-1 win over Fiorentina and lifted them back into second place in Serie A.

The win was revenge for La Viola's 3-0 victory in last week's rescheduled league game and moved Inter to within one point of leaders Napoli after 24 games.

More than 67,000 fans at the San Siro on Monday night saw Austria international forward Arnautovic glance home the winner with his head, seven minutes into the second half.

Inter took a first-half lead thanks to the intervention of in-form striker Lautaro Martinez. His header took a deflection on the way in and was given as an own goal by Marin Pongracic.

Fiorentina levelled a minute before halftime with the help of the video referee. The match referee initially waved away shouts of a handball by Matteo Darmian but awarded a spot kick after looking at the VAR, and Rolando Mandragora made no mistake from the spot.

But Arnautovic's header was a killer blow for Fiore, who remain one point behind Juventus in sixth place on the table and 13 behind Napoli.