The Brazilian star accused Marseille"s Alvaro Gonzalez of racism as he exited the pitch after his red card, which was earned when he slapped the defender on the back of the head in a game-ending brawl.
Pitch side microphones caught Neymar making the accusation to the fourth official,
and the PSG forward then repeated his assertion to a nearby camera after VAR confirmed his red card.
Having been excused from duty for the first two rounds of 2020-21 due to their exertions in the delayed Champions League knockout stages, Thomas Tuchel"s men were back in action this weekend as they welcomed l"OM to Parc des Princes.
There is little love lost between the capital side and Marseille, but a bad-tempered game that saw 36 fouls committed and 12 yellow cards handed out inside the 90 minutes eventually spiraled out of control deep into injury time.
A tussle between Argentine pair Dario Benedetto and Leandro Paredes quickly escalated into an all-out brawl between PSG and Marseille players, with Neymar in the thick of things.
The Brazilian slapped Gonzalez on the back of the head, while Layvin Kurzawa and Jordan Amavi also traded blows.
Once order was restored referee Jerome Brisard showed a straight red to Neymar, Kurzawa and Amavi for their part in the fracas.
After the game, Neymar tweeted "The only thing I regret is not being in the face of this asshole". PSG have now lost their first two opening games of the Ligue 1 season.
