Champions Cup organisers have confirmed that they have not received any formal complaint of verbal abuse arising from Saturday's Ulster v Racing 92 game.
Former Munster winger Simon Zebo posted a message on social media saying that comments directed at him from the crowd were "not on" and Ulster have vowed to "investigate any complaints received."
Zebo's tweet, sent on Saturday evening, read: "A tough place to play but great effort from the boys, 2 important points on the road.
"Also I hope my ears deceived me with some comments directed my way from the crowd #NotOn. Django wins in the end."
Yesterday, an EPCR media spokesperson issued a statement in response to queries from the Irish Independent.
"EPCR has not received a formal complaint from Racing 92 regarding any alleged case of verbal abuse of one of the club's players during yesterday's Heineken Champions Cup, Pool 4 match at the Kingspan Stadium," it said. "EPCR is in contact with both Ulster Rugby and Racing 92, and will be making no further comment at this point."
Ulster Rugby also issued a brief statement, saying: "Ulster Rugby condemns all forms of abuse and will work with the relevant parties to robustly investigate any complaints received."
Zebo scored a try in the first-half of a 26-22 defeat for his side but was replaced at half-time after suffering from a dead leg.
In the team's previous fixture, Zebo pointed his finger at Ulster full-back Michael Lowry before scoring a try in that game and was immediately told to apologise to his young opponent by referee Nigel Owens.
Following that game, Zebo issued a public apology to Lowry after giving his shirt to the Ulster player.