Tottenham Hotspur manager Andre Villas-Boas has urged UEFA to take action against alleged racist chanting during Spurs' Europa League group game against Lazio at White Hart Lane.
It is alleged that Lazio fans made monkey chants on numerous occasions towards Tottenham players Aaron Lennon, Andros Townsend and Jermain Defoe.
Villas-Boas stressed that he himself did not hear the words but believes the travelling Lazio fans may have been guilty of such improper conduct.
"I think UEFA will act if the accusations are proven," the Portugese manager said after the game, adding.
"UEFA is very active on this kind of situation so and our overall objective is to kick racism out of football. I can't point the finger at anyone in any way shape or form tonight because I didn't hear anything. It's for the authorities to follow up in any kind of investigation."
Football Against Racism in Europe (FARE), a prominent anti-racism group, have also raised concerns against Lazio fans at White Hart Lane and have posted these on their Twitter account: "British media + fans on social networks report racism directed at Tottenham striker Jermain Defoe during Europa League match v Lazio."
Neither of the concerned clubs or UEFA have made official comments on the matter, although it is understood Spurs are considering a formal complaint.
The match itself finished a scoreless draw but there were plenty of talking points throughout the 90 minutes, even without claims of racist behaviour. Spurs were clearly the dominant force through the match, comprehensively outplaying their visitors. However, White Hart Lane faithful were forced to settle for a draw despite the ball finding the back of Lazio's net three times.
All three goals - from Clint Dempsey, Gareth Bale and Steven Caulker - were ruled out.