The Italian Federation's prosecutor decided to open an investigation into Milan players' chants against Juventus after their victory over Roma.
Milan defeated Roma in the third round of the Italian League, 2-1, at the Olympico.
And the Milan players appeared, in a video published by Rafael Leao, on the team bus, shouting satirical chants from Juventus.
The investigation will focus on “the possible violation of the pillars of loyalty, integrity and righteousness and identifying those responsible,” according to the Italian News Agency.
Milan leads the standings after 3 rounds with 9 points after wins over Bologna, Torino and Roma.
Juventus is preparing to host Empoli in the third round of the Italian League.
Juventus started the season with a win over Udinese and a draw with Bologna.