Uefa are to investigate an anti-semitic banner that was unfurled by Partizan Belgrade fans during their side's Europa League match against Tottenham Hotspur.
Spurs staff pointed out the flag, which had "Only Jews and P******" emblazoned in a logo from BBC sitcom 'Only Fools and Horses', to officials during the Premier League club's 0-0 draw in Belgrade.
Manager Mauricio Pochettino condemned the racist slogan, describing it as "unacceptable".
"I didn't see it," the Argentine said. "The club is aware but I did not see [it myself]. But if this is true, then it is an unacceptable thing. It is very disrespectful. This is a shame, very disrespectful and unacceptable."
The incident comes two years after ugly scenes in Serbia when the England u-21s were racially abused by vitriolic fans.
That night Tottenham's Danny Rose reacted angrily to racist chants and his absence in last night's match was scrutinised ahead of kick off.
Partizan's coach, Marko Nikolic, was seemed unaware of the banner and thanked the crowd for their support.
"I want to congratulate the crowd," Nikolic said. "The support was great and not only great but everything went well. It was a wonderful, sporting environment without the slightest problem."
Partizan could face censure over the incident and be forced to play future matches behind closed doors at the Partizan Stadium.
Spurs, a club with a large Jewish following, have for years been targeted with anti-Semitic taunts from opposing fans.
Earlier this year, charges against three Spurs fans who allegedly defiantly chanted the word "Yid" were dropped by prosecutors.
The trio were accused of a public order offence for using the word during matches in October and November last year.