Former Manchester United defender Patrice Evra is under investigation by the High Court of Paris for anti-gay remarks aimed at Paris Saint-Germain.
Evra received criticism from former Monaco teammate Jerome Rothen for his celebrations after United eliminated PSG from the Champions League in March.
PSG later condemned Evra in a statement and expressed a desire to support any action taken by partners Rouge Direct, Sportitude and SOS Racisme.
"PSG strongly condemns Patrice Evra's homophobic insults towards the club, its representatives, and its former player [Rothen], in a video broadcast across social networks," PSG's statement said. "These remarks deeply shocked a club very attached to the values of respect and openness towards each other.
"The fight against homophobia and all forms of discrimination is at the heart of PSG's actions and values, which has worked alongside Rouge Direct to fight homophobia, as well as Sportitude against all forms of racism.
"PSG will support any initiative taken by associated partners Rouge Direct, Sportitude and SOS Racisme."
Evra has since apolgised for the "misunderstanding" with a video on Twitter.
Rouge Direct were involved in the investigation opened into Evra's comments and spokesperson Julien Pontes welcomed the news.
"It is of great satisfaction to us at Rouge Direct," he told AFP. "We welcome the speed of the Paris prosecutor's reaction, who decided that the law does apply to Mr. Evra.
"With a bit of determination, we can start to sanction procedures that have not yet been seen before in the footballing world."
Pontes added that Rouge Direct are hoping Evra is handed "an exemplary punishment."
Meanwhile, Rothen confirmed on RMC Sport's After Foot show that he is pressing charges against Evra, and noted the opening of the investigation into his former Monaco teammate's comments.
"I had decided well before [Paris' High Court opened an investigation], with my lawyer, to press charges," he said.