UEFA have launched an investigation into PSG star Neymar's reaction in defeat to Champions League opponents Manchester United.
The Brazilian used Instagram to aim an expletive and insults at video review officials who intervened before Man United was awarded a stoppage-time penalty for handball that eliminated PSG.
Neymar wrote: "This is shameful! And they still let four guys that do not understand football look at the slow motion video, this doesn't happen! How is he going to take his hand out when he's on his back! Oh go f*** yourself."
UEFA says it "appointed an ethics and disciplinary Inspector to conduct an investigation" of the social media comments.
The UEFA disciplinary committee could judge any resulting charge at its March 28 meeting.