The Brazil global blasted the use of VAR to award Manchester United a late penalty in their 3-1 Champions League round-of-16 second-leg win at Parc des Princes last week that secured a 3-3 away goals success.
The referee awarded a penalty to the Red Devils for handball by Presnel Kimpembe in the final moments of the game, and Marcus Rashford converted the spot-kick to eliminate the Ligue 1 champions from the competition.
Paris Saint-Germain's Brazilian star Neymar has landed himself in hot water with UEFA following foul-mouthed comments posted on his Instagram account following PSG's Champions League exit against Manchester United.
The 27-year-old was so reportedly enraged he had to be restrained by PSG staff to stop him entering their dressing room.
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The Brazilian, sidelined by injury, was infuriated by a late penalty awarded to United in PSG's last-16 second-leg defeat in Paris which saw them go out on away goals and Neymar later called the VAR system a "disgrace".
"And UEFA still pick four guys who know nothing about football to review the VAR decision in slow motion. that handball simply doesn't exist!"
In a statement released on Wednesday afternoon, European football's governing body said it had "appointed an ethics and disciplinary inspector to conduct an investigation" into Neymar's comments.
Neymar missed both legs of the tie after injuring his foot in January.