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France centre Bastareaud apologised on social media and was defended by Boudjellal.
"At no point did Mathieu Bastareaud make a judgement on the sexual orientation of the player in question," Boudjellal told rugbyrama.fr.
"I am not homophobic but I have already called someone a faggot. It's become customary, it's the first thing that comes to mind in an altercation."
Boudjellal fears his player will be heavily punished.
"I am worried. What I fear is the mormon side of EPCR with the Welsh and the Irish," he said.