Four Manchester United fans received jail sentences of up to 29 months for violence that preceded their Uefa Champions League game with AS Roma on December 12.
According to public prosecutor Katia Summaria, the fans were part of a 70-strong band of hooligans that English police warned their Italian counterparts about before the game.
Armed with rocks and other harmful objects, the group confronted Roma fans outside the stadium, according to the ANSA news agency.
Two of the fans received jail sentences of 28 months for resisting police.
The other two were sentenced for an extra month because they were also accused of damaging public property, according to ANSA.
Prosecutors in Rome were not reachable for comment.
The match ended in a 1-1 draw.