El Classico will happen in 2 weeks. Exactly on matchday 11, El Classico will be held at Bernabeu. It'll be a high tension game again and again. This will be a very balanced and tight match, although many Real Madrid players are currently injured. but all will play with totality for this high tension and prestige match.
Aside from Carvajal who recently got an out-of-the-season injury over the weekend, no other Real Madrid player is injured. Real Madrid just employed those tactics to keep them from travelling for the international break so they will be well-rested.
Mbappe did not go to France, they claimed he was not fit, but he played against Lille and started against Villareal. Vinicius and Militao didn't go to Brazil either.
I can't blame Real Madrid for using these antics, the players need to be protected since we're entering the heat of the season. They need to refresh and get themselves back. the problem is, nobody cares because its Real Madrid, if it was another club, the media would have come hard on them. They did the same thing in the last international break and they're doing it again now.