Thuggish Arsenal fans took turns punching a supposed Bayern Munich infiltrant during their 2-2 Champions League draw on Tuesday night.
A handful of supporters landed blows on the man while most in the vicinity paid little attention - before some started chanting 'Arsenal, Arsenal'.
Bayern fans had been banned from attending the match after throwing fireworks on to the pitch at Lazio in the last 16.
Stewards promptly dealt with the situation - which was only instigated by a few rowdy individuals - and ushered the man away.
Arsenal drew 2-2 with Bayern Munich as goals from Bukayo Saka and Leandro Trossard weren't enough to better Serge Gnabry and Harry Kane's efforts.
The club insisted that they would ban any season-ticket holder or member found to be selling tickets to away supporters.
However, tweets from supporters complained that Bayern followers had found their way into the East Stand.
Another tweet, seemingly from an Arsenal fan, issued a call for Bayern supporters to come forward and purchase a ticket from them.
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