French rugby union player, Mathieu Bastareaud, is under investigation for making a homophobic comment during Sunday's European Champions Cup victory over Benetton.
The Toulon centre will face disciplinary action after the tournament organisers, European Professional Club Rugby, said they would look into the incident.
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A ban would eliminate Bastareaud's chances of playing in the Six Nations, with France's opening match against Ireland on February 3.
Bastareaud has since apologised on social media, tweeting "I want to apologise for my reaction to the player's insults".