Inter strengthened their hold on the Serie A top spot by beating Cremonese 2-0 away on Sunday thanks to goals by Lautaro Martinez and Piotr Zielinski.
Cristian Chivu's side have 55 points from 23 games, eight points more than second-placed AC Milan, who can cut the deficit back down to five points by beating Bologna at San Siro on Tuesday.
Inter's victory was marred by one of their fans throwing a flare that hit Cremonese keeper Emil Audero, causing the match to be suspended for several minutes.
Champions Napoli are third with 46 points after beating Fiorentina 2-1 at home on Saturday.
Juventus are one point further back in fourth thanks to a 4-1 win at Parma on Sunday.
AS Roma can regain fourth place and pull level on points with Napoli if they beat Udinese away later on Monday.
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