Polish police are reportedly hunting for the Chelsea and Real Betis fans who clashed in Wroclaw on Tuesday night - and the media have branded them 'thugs'.
Locals have been ordered to report any 'dangerous incidents' as the police and city guard look to stamp out any trouble before the Europa Conference League final.
Supporters dscended on the Salt Market Square and clashed outside a restaurant on the eve of the final, with fans desperately trying to fend off police, throwing chairs and other objects towards them.
Scenes turned sour after a reported series of 'scuffles' between fans and pepper spray was apparently unleashed on unruly individuals.