Manchester United fans have taken to social media to criticise Casemiro for giving the ball away in the build-up to Everton's opening goal on Sunday evening.
Everton midfielder Amadou Onana dispossessed the former Real Madrid defender on the edge of United's box in the first five minutes of the game.
The ball then worked its way to Alex Iwobi - who curled the ball into the top corner of the net to give Frank Lampard's team the advantage.
United fans were furious with Casemiro - who was handed his first Premier League start under Erik ten Hag.