About 20 Milan fans were arrested in Seville last night, ahead of the Europa League game with Real Betis.
The Rossoneri lost at San Siro in the first match between the two, and will look to make up for that tonight.
According to Mundo Deportivo though, around 20 fans were arrested for disorderly conduct close to the city cathedral last night.
The group is said to have caused damage to public buildings, as well as cars and buses which passed close.
The fans also threw flares and smoke bombs, meaning the police had to intervene.
As a result, security will be stepped up around the stadium tonight.