The match would have been played without an audience, but in photos that the news agency AP has taken part in, it can be seen that supporters of the home team went to the upper parts of the stands and from there directed several derogatory comments towards the Swede.
Zlatan Ibrahimovic was in the match squad but rested and got from the stands to see his Milan lose to 2-2 in the final minutes.
- We have done everything we can for the organization around the match to maintain the same high level as the team and we will not allow a lone primitive person to stain our country and our people's welcoming tradition, the club writes.
The insults must have been of the nature used condescendingly towards Muslims of Bosnian descent.
The 39-year-old Swede has his roots in both Bosnia and Croatia.
The Serbian Red Star states that they will punish the individual heard in that clip.