Loud monkey-chanting was heard to come from the away end on several occasions directed against Jermain Defoe, Aaron Lennon and Andros Townsend in the Group J clash, which ended 0-0 after three Spurs goals were controversially ruled out.
UEFA president Michel Platini was in attendance for the game.
"I think (UEFA will act if the accusations are proven)," Villas-Boas said in his post-match press conference.
"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."
The anti-racism group FARE posted a link on their Twitter feed giving Spurs fans the chance to report any chants they heard from the away end and UEFA have fined clubs in the past for racist incidents.
Tottenham also operate a strict zero tolerance policy when it comes to racism.