Gabriel Agbonlahor said Casemiro looked like a 45-year-old as Manchester United were ripped to shreds by Brighton.
The Brazilian midfielder was one of several sub-par United performers as they slumped to a miserable 3-1 defeat at Old Trafford.
It is the third defeat suffered by Erik ten Hag's side in their opening five Premier League matches this season as the club battles strife both on and off the field.
Former England striker Agbonlahor, speaking on talkSPORT, didn't pull any punches in his assessment after goals by Danny Welbeck, Pascal Gross and Joao Pedro earned Brighton a fourth consecutive league win over United.