Neymar faces a potential Champions League ban after Uefa charged the PSG star with "insulting and/or molesting" the referee following his post-game rant against Manchester United.
The Brazil forward, who was sidelined for the round-of-16 tie by injury, lashed out following PSG's spectacular second-leg home defeat to United, which saw them exit the competition on away goals.
Referee Damir Skomina awarded United an injury-time penalty after consulting the video assistant referee (VAR) system, with Presnel Kimpembe adjudged to have handled a shot by Diogo Dalot.
Marcus Rashford scored the resulting spot-kick to send United through to the quarter-finals, with Neymar labelling VAR "disgrace."
Neymar wrote on his Instagram story: "They put four guys that do not understand football to watch it in slow motion. This doesn't exist!"
He then used profanity while writing about the video assistants.
Uefa investigated Neymar's comments, and have since charged the PSG forward.
"Disciplinary proceedings have been opened following the Uefa Champions League Round of 16 second leg match between Paris Saint-Germain and Manchester United FC (1-3), played on 6 March in France," Uefa said in a statement.
"Player Neymar Junior - insulting / molesting acts against match official (statements made by the player following the above-mentioned match) - Art. 15 (1) (d) of the UEFA Disciplinary Regulations."
If the Brazilian is found guilty, he could be suspended for three matches in the competition for insulting match officials.
Uefa's Control, Ethics and Disciplinary Body will look into the case and a date for the hearing is yet to be confirmed.
PSG coach Thomas Tuchel had said after the game that he understood Neymar's anger and defended his comments, saying they were made in the heat of the moment.
Additional reporting by Reuters.
