The Italian Football Federation is investigating last week’s dispute between Zlatan Ibrahimovic and Romelu Lukaku during the Milan derby.
The former Manchester United team-mates received yellow cards after an argument and a head-to-head confrontation between their partner just before half-time, which continued through the tunnel during half-time.
The referee, Paolo Valeri, was questioned by prosecutor Giuseppe Chin to explain the sanction imposed during the quarterfinals of the Italian Cup on Tuesday.
The duo could be seen and heard exchanging insults as Lukaku had to be restrained by his teammates as he attempted to face the Swedish striker.
Ibrahimovic, who gave Milan a lead in the first half, was sent off after receiving a second yellow card after the break, before Christian Eriksen scored a game-winning goal in added time for Inter to send them with a 2-1 win.
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AC Milan striker Ibrahimovic and Inter Milan striker Lukaku were each sanctioned for one game after the incident.
Ibrahimovic was sanctioned after receiving two yellow cards, one of them for the clash with Lukaku, who was sanctioned to be his second yellow card in Coppa Italia this season.
Lukaku will miss the first leg of the semi-finals against Juventus on Tuesday, while Ibrahimovic will have to miss his next game of the competition.
Ibrahimovic has denied using racist language in the altercation.
in one social media post Last Wednesday, the Swede said: “In Zlatan’s world there is no room for racism”.