Four Spanish fans and an American were injured in the brawl, which broke out in Rome ahead of Thursday’s UEFA Europa League clash between Lazio and Sevilla.
Around 40 people were reportedly involved in the violent incident.
Police in riot gear were called to the scene to break up the fight.
Il Messaggero journalist Michele Galvani described the scene as “like a war”.
“Everything was quiet, when suddenly we heard shouting and the sound of broken glass,” a local bar owner told Italian daily La Repubblica.
“We rushed to the window and saw guys with hoods armed with clubs and batons that were attacking other guys.”
Investigations are underway to determine what happened and identify the perpetrators.
