Chelsea defender Wesley Fofana has described a video posted on social media by his club team-mate Enzo Fernandez as "uninhibited racism".
The video, posted by Argentina international Fernandez on his Instagram account, featured a song sung by some of the Argentina squad about France's players.
The 23-year-old midfielder later apologised for the video where Argentina players were celebrating winning the Copa America after beating Colombia 1-0 in Sunday's final.
"The song included highly offensive language and there is absolutely no excuse for these words," Fernandez said on Instagram.
"I stand against discrimination in all forms and apologise for getting caught up in the euphoria of our celebrations. That video, that moment, those words, do not reflect my beliefs or my character."
France international Fofana commented on the video on social media platform X, writing: "Football in 2024: uninhibited racism." The comment was accompanied by a clip from the video.
English media reported that Chelsea were investigating the video.
Chelsea released a statement on Wednesday morning welcoming Fernandez's apology, while announcing disciplinary proceedings. Football's world governing body FIFA said it too was investigating.
"Chelsea Football Club finds all forms of discriminatory behaviour completely unacceptable," the statement read.
"We are proud to be a diverse, inclusive club where people from all cultures, communities and identities feel welcome.
"We acknowledge and appreciate our player's public apology and will use this as an opportunity to educate. The club has instigated an internal disciplinary procedure."
The French Football Federation (FFF) said the video included an alleged "racist and discriminatory" chant and that it would file a complaint to global soccer's governing body FIFA.
"Faced with the seriousness of these shocking remarks, contrary to the values of sport and human rights, the president of the FFF decided to directly appeal to his Argentinian counterpart and FIFA and to file a legal complaint for racially offensive and discriminatory remarks," the FFF said.
The Argentinian Football Association did not immediately respond to requests for comment.
A FIFA spokesperson said: "FIFA is aware of a video circulating on social media and the incident is being looked into. FIFA strongly condemns any form of discrimination by anyone including players, fans and officials."
France striker Kylian Mbappe and other players of African descent on the national team received racist abuse after they lost to Argentina in the 2022 World Cup final, prompting a senior French cabinet member to call for a FIFA investigation.
Argentina beat Colombia to collect a record 16th Copa America title on Sunday.
