UEFA and French police have opened an investigation into allegations that Juventus fans made "Nazi salutes and monkey noises" in a game against PSG.
The report from the Associated Press comes after the Italian side lost 2-1 in Paris thanks to goals from Kylian Mbappe.
It is said four fans were detained after Paris police reviewed surveillance footage from the game.
And now an investigation is being launched into allegations of public provocation of racial hatred from the travelling away support.
Uefa say an ethics and disciplinary inspector has been appointed to "conduct a disciplinary investigation regarding allegations of discriminatory behaviour by Juventus supporters."
According to Uefa rules, Juventus are responsible for the behaviour of their fans at the stadium.
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Juventus could be made to close part or all of their stadium for a Champions League match and pay a fine as part of a possible punishment.
The 36-time Serie A champions have not made any public comments on the allegations of racism during the game at PSG.
Juventus' next Champions League match is scheduled for September 14 against Benfica.
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Massimiliano Allegri's side found themselves a goal down to PSG just five minutes into the match when Mbappe opened the lead.
The Frenchman then doubled his tally on 22 minutes to leave Juventus two down before the break.
Substitute Weston McKennie did pull one back on 53 minutes but the Ligue 1 kings held out to win.
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