Casemiro came off with an ankle injury in the national team's World Cup qualifying draw against Venezuela last Friday but he then started and completed the full 90 minutes in Brazil's 2-0 defeat to Uruguay in Montevideo on Tuesday evening.
The 31-year-old has remained in Brazil to allow additional recovery time and he will miss United's Premier League fixture away to Sheffield United tonight.
Casemiro is also suspended for the Champions League visit of Copenhagen on Tuesday and United then host City on October 29.
Despite Casemiro playing with the knowledge he could have aggravated his ankle problem, Ten Hag insisted he is not unhappy with the midfielder that he played against Uruguay. "You can't - they are the rules.
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