Serie A leaders Inter went nine points clear on Saturday after celebrating their centenary with a regulation 2-0 win over second-from-bottom Reggina.
AS Roma can cut the gap back to six points on Sunday if they win at Napoli, where Inter suffered their first defeat of the league season last weekend.
Zlatan Ibrahimovic, returning from injury in time for Tuesday's Champions League clash with Liverpool, netted with a 14th minute penalty after Esteban Cambiasso was sandwiched by Carlos Adrian Valdez and Luca Tognozzi.
Usual right back Nicolas Burdisso, playing in central defence because of Inter's injury problems, made it 2-0 on 34 minutes with a bullet header from Luis Jimenez's deep free kick.
Picture:Inter President Massimo Moratti (R) holds a shirt as Italian singer Adriano Celentano (C) performs during the ceremony to celebrate the century of Inter Milan after the Italian Serie A soccer match against Reggina at the San Siro stadium