Yes, you are right. Casemiro's departure did not overwhelm Real Madrid, although there are several options to replace Casemiro. but i don't think carlo ancelloti will experiment, aurelien tchouameni is a young player who is as good as any other midfielder.
Real Madrid is actually projecting Tchouameni in its long term plans. however, the sudden departure of casemiro to Old trafford, made ancelotti have extra attention on the midfielders at their disposal.
although in the match against Almeria Tcouameni did not perform optimally, but I think Aurelien Tchouameni will be the starting lineup to replace Casemiro's next position.