Napoli scored twice before halftime and hit the woodwork three times before clinging on for a 2-1 victory over 10-man Lazio in Serie A on Sunday.
2018 ScheduleAll times ET
There were reports of Lazio supporters chanting about Rome's African population and antisemitic abuse aimed at Roma supporters against Novara.
Lazio's Champions League hopes took a knock on Saturday when they were held to a 1-1 draw at home by Torino in a bad-tempered game.
Inter notched a big win over Napoli on Boxing Day, albeit one overshadowed by sad events around the pitch. Elsewhere, Roma must get it together.
Lazio defender Francesco Acerbi suffered double frustration on Monday when he was booked for celebrating what he thought was a stoppage-time equalis
UEFA have opened disciplinary proceedings against Frankfurt after their fans caused trouble in Rome, but have not done so with Lazio.
Frankfurt were in the city to play Lazio in the Europa League, with the Bundesliga side winning 2-1.
The 51-year-old was arrested at Durham train station in northern England in August and later released while police investigated the incident.
Riccardo Saponara scored the latest Serie A goal since records began to earn Sampdoria a 2-2 draw at Lazio
Lazio coach Simone Inzaghi was sent off and initially refused to leave the touchline after celebrating his team's stoppage-time equaliser vs. Milan.
Lazio president Claudio Lotito has said his club are not under any pressure to sell Sinisa Milinkovic-Savic, but would sell for the right price.