Manchester United have already decided not to appeal Casemiro's sending off against Southampton, with the midfielder set to miss their next four games.
The Brazilian was shown a straight red card by referee Anthony Taylor 11 minutes before the break in the goalless draw with the Saints. His overzealous tackle on Carlos Alcaraz had been adjudged to be a yellow card offence on first viewing.
But VAR Andre Marriner called Taylor to the pitchside monitor and the card was changed to a red one. It was Casemiro's second sending off in three Premier League games and marks a huge blow to their hopes of turning around their recent poor form.