Romelu Lukaku's management company reacted with outrage after the Inter Milan forward was shown a second yellow card and then sent off for a gesture toward Juventus fans who directed racist chants at him.
The incident occurred after Lukaku converted a penalty in stoppage time to earn Inter a 1-1 draw in the Italian Cup semifinals on Tuesday.
Lukaku held his finger to his lips as if to silence the crowd after scoring.
Lukaku's gesture enraged Juventus players and the game ended in a scuffle between the two squads, with Juventus winger Juan Cuadrado and Inter goalkeeper Samir Handanovic also sent off.
"Tonight's racist remarks made towards Romelu Lukaku by Juventus fans in Turin were beyond despicable and cannot be accepted," Roc Nation Sports International president Michael Yormark said. "Before, during, and after the penalty, he was subjected to hostile and disgusting racist abuse. Romelu celebrated in the same manner he has previously celebrated goals.
"The referee's response was to award a yellow card to Romelu. Romelu deserves an apology from Juventus, and I expect the league to condemn the behaviour of this group of Juventus supporters immediately," Yormark added. "The Italian authorities must use this opportunity to tackle racism, rather than punish the victim of the abuse."
Lukaku himself added on Instagram: "History repeats. Been through it in 2019.. and 2023 again..I hope the league really take actions for real this time because this beautiful game should be enjoyed by everyone."
The Italian league on Wednesday issued a statement in which Lukaku was not named but said that it "strongly condemns every episode of racism and every form of discrimination."
"A few people in the stands cannot ruin the soccer show and don't represent the thoughts of all the fans," the league said.
The league judge will likely open a disciplinary case into the matter, while Juventus said it would collaborate with authorities to identify the fans responsible.
It said: "Juventus Football Club, as always, are collaborating with the police to identify those responsible for the racist gestures and chants which took place last night. The Codice di Gradimento will be applied to those responsible."
Lukaku, who is Black, has been subjected to racist chants on numerous occasions during his two stints at Inter.
Lukaku, on loan at Inter from Chelsea, was also the target of offensive chants in 2019, which he condemned in a social media post at the time.
"History repeats... Been through it in 2019.. and 2023 again..," Lukaku said in a post on Instagram on Wednesday.
"I hope the league really take actions for real this time because this beautiful game should be enjoyed by everyone..."
Racism has been a long-running problem in Italian football and authorities have been criticised for not taking strong enough action.
Information from Reuters was included in this report.