Manchester United star Fred has stunningly avoided a straight red after headbutting PSG counterpart Leandro Paredes in the Champions League.
The Parisians were up in arms midway through the first half after an off-the-ball altercation between the two South Americans, in which the Argentine midfielder was left sprawling on the Old Trafford turf.
Television replays showed that the Brazilian forced his head into his rival's, in what would ordinarily be a straight card offence.
The Italian referee was advised by VAR to go to the pitchside monitor to review the incident, but inexplicably opted to brandish a yellow card for the 27-year-old.