Casemiro was not happy with one of his Manchester United teammates, following the yellow card that rules him out of the big game with Arsenal, giving his colleague a death stare.
Going into Wednesday night's game with Crystal Palace, Casemiro knew he was walking a tightrope having picked up four yellow cards in the league.
Another would mean missing the huge game with the league leaders on Sunday, and not being involved with the battle against Thomas Partey, with both men recently described as the best defensive midfielder in the world.
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Some might even argue that the Brazilian didn't need to have been risked but such is his desperation to play that it would have been difficult to have played them.
The former Real Madrid midfielder managed to make the first 80 minutes without ever looking like he was going to be booked, and then disaster struck for United.
With Fred readying himself to come on for his fellow Brazilian, Casemiro stopped a Wilfried Zaha run with a nasty looking challenge that had to draw a yellow card.
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Steve McClaren slumped into his seat, making it very clear what the coaching staff were feeling, and he wasn't the only one who made his emotions obvious.
Casemiro could be seen having a chat with Bruno Fernandes and looking extremely unimpressed with his teammate, after the Portugal star missed out on the ball to Tyrick Mitchell, and failed to challenge him for the ball, in the build up.
Certainly Jamie Redknapp seemed to agree that it was Fernandes who was to blame for the yellow card, that could really cost the team on the weekend.
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"From Manchester United’s point of view, it couldn’t have got any worse," the former Liverpool midfielder told Sky Sports after the 1-1 draw.
"We spoke before the game about Casemiro, don’t get a yellow card. Don’t get booked, don’t get in any confrontations, he is so important and they need him on Sunday.
"He gets booked and it is as if it took the sting out of Manchester United, it affected them so much, they knew their talisman and most important player in that defensive role had gone.
"It was a moment of madness, you can see he was furious with his teammate Bruno Fernandes, he jumps out of a challenge and that is how he ends up getting booked. It could have been a red card.
"Mikel Arteta would have been jumping around his living room, they [United] have got no one who can do like he does in the team.
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"As a player in that position, all his career he has made those tackles, you get booked sometimes but it is instinct. It is what he has done, he doesn’t know what else to do.
"Of course he doesn’t want to make the challenge because he knows the consequences. But he is furious there with his player. If looks could kill. They just couldn’t get over it."
Facing the league leaders without their best midfielder will likely be a problem for United but Erik ten Hag was certainly in bullish mood about it.
The United boss reacted to the yellow card, saying, "Last time we beat Arsenal without Casemiro, now we have to do that again."
Topics: Manchester United, Premier League, Crystal Palace, Arsenal, Casemiro, Bruno Fernandes