Lazio hooligans attacked Real Sociedad fans in Rome on the eve of Thursday’s Europa League match between the two teams.
A group of Real Sociedad fans were set upon as they were at a pub in the Monti district of the Italian capital on Wednesday night.
The attackers, who were armed with clubs, knives and other weapons, fled when police arrived.
Nine Real Sociedad fans were injured. Three of the injured suffered stab wounds. One, aged 23, was in serious condition.