Police say a group of about 70 Real Sociedad fans has been attacked at a local bar in Rome overnight ahead of the Spanish club’s Europa League match at Lazio.

Lazio beat 10-man Real Sociedad 3-1 at Rome's Olympic Stadium on Thursday night to clinch their place in the Europa League top eight with a match to spare. Mario Gila, Mattia Zaccagni and Taty Castellanos scored for the Roman side in the first half.

Nine people have been left injured, one seriously, after violent clashes between groups of Lazio and Real Sociedad supporters in Rome on the eve of the Europa League meeting between the two sides, according to reports in Italy.