Martin Keown has claimed Erik ten Hag is also to blame for Casemiro's slump in form after he made another mistake in Manchester United's loss to Arsenal.
The veteran midfielder was again fielded as an emergency defender alongside Jonny Evans at Old Trafford on Sunday, with Ten Hag missing all but one of his senior centre backs, but made a sloppy error in the build-up to Leandro Trossard's goal.
After Andre Onana launched a long ball down the pitch, Casemiro failed to race out to play Kai Havertz offside, allowing him to fire in a low cross for Trossard to score.