Casemiro was at fault for Luis Diaz's two goals before the break and was promptly replaced by Ten Hag for youngster Toby Collyer.
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During the second-half, there were claims Casemiro had left the stadium and traveled home.
But after the 3-0 reverse, Ten Hag told talkSPORT: "It's not true. He was in the dressing room. I just met him."
Casemiro's deal with United runs to 2026.
