Two Real Sociedad supporters remained hospitalised on Thursday following an alleged assault by Lazio's hardcore fans before a match in Rome, according to the Spanish club's statement.
According to Real Sociedad president Jokin Aperribay, nine of their supporters sustained injuries during the confrontation, which involved the use of knives and fireworks.
"Of the nine who received medical attention, two are still hospitalised," he told Spanish media.
Approximately 80 Lazio "ultras" confronted about 70 Real Sociedad supporters who were visiting the Italian capital for Thursday's Europa League fixture at the Olympic Stadium, as reported by the AGI news agency.
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Lazio issued a statement confirming their complete cooperation with ongoing investigations, while pledging to implement "the strictest measures" against supporters involved in the violent incidents.
According to reports, assailants wearing black clothing with concealed faces attacked Spanish supporters in Rome's historic Monti district, inflicting beatings and stab wounds.
Reports also suggested that the authorities have confiscated various weapons from Lazio ultras, including knives and hammers, and detained several individuals in connection with the incident.
