Marseille midfielder Mario Lemina received a straight red card after punching his opponent Ola Toivonen in the groin during Saturday's 1-1 draw with Rennes.
The 21-year-old reacted angrily to an accidental kick in the back as the pair tussled for the ball in the closing stages of the game, lashing out at the Sweden international with a swift jab to his private parts.
Referee Amaury Delerue was left with no choice but to dismiss Lemina, who could now face a lengthy retrospective ban for the cowardly act of violence at Route de Lorient.
It was Toivonen that had actually given Rennes the lead in yesterday's fixture, but his first half strike was cancelled out by debutant Lucas Ocampos who drew Marseille level on the hour mark before Lemina's moment of madness.
The result leaves Marcelo Bielsa's one point behind Ligue 1 leaders Lyon, who meet defending champions Paris Saint-Germain later on Sunday.
The French Football disciplinary panel have a reputation for dishing out hefty punishments for unacceptable conduct, as was proved by the six-month suspension handed to Bastia striker Brandao following his head-butt on PSG midfielder Thiago Motta in the tunnel at the Parc des Princes.
With that in mind, Lemina should probably expect to see the book thrown at him for his ugly unsportsmanlike conduct.
You can watch footage of the incident in the video below, and leave a suggestion with what you think is a suitable punishment in the comment box provided.