Chelsea have "instigated an internal disciplinary procedure" following Enzo Fernandez's video posted on social media, which the French Football Federation alleges is racist.
Fernandez and some of his Argentina team-mates were chanting a derogatory song about the France team in an Instagram live video published on his account after they beat Colombia in the Copa America final on Sunday.
Wesley Fofana, Fernandez's Chelsea team-mate, reposted the video on X with the words: "Football in 2024: uninhibited racism".
Fernandez later apologised on Instagram for posting the video and any offence its content may have caused.
On Wednesday morning Chelsea released a club statement: "Chelsea Football Club finds all forms of discriminatory behaviour completely unacceptable. 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 Blues' statement comes after Fernandez said he was "truly sorry" for the video.
"The song includes highly-offensive language and there is absolutely no excuse for these words," the 23-year-old said.
"I stand against discrimination in all forms and apologise for getting caught up in the euphoria of our Copa America celebrations.
"That video, that moment, those words, do not reflect my beliefs or my character.
"I am truly sorry."
French Football Federation to file legal complaint
The French Football Federation has said it will file a legal complaint alleging "racially offensive and discriminatory remarks" were made by Argentina players.
In a statement, the FFF - the governing body of French football - said its president Philippe Diallo would challenge FIFA president Gianni Infantino and Argentina Football Association boss Claudio Fabian Tapia to respond to the alleged remarks.
The statement read: "The president of the French Football Federation, Philippe Diallo, condemns in the strongest terms the unacceptable racist and discriminatory remarks which were made against the players of the French team in the context of a song sung by players and supporters of the Argentina team after its victory in the Copa America and broadcast in a video on social media.
"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 challenge his Argentinian counterpart and FIFA, and to file a legal complaint for insulting remarks of a racist and discriminatory nature."
Argentina beat France in a penalty shoot-out in the 2022 World Cup final, a match around which some fans of the Argentina team were heard to sing discriminatory songs.
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