You are right. In the Champions League since their opponent PSG. They are a very strong and star rich team. The strategy of the match against PSG will have to be arranged by Real Madrid even earlier. And they will do their best to ensure that no important player gets injured before the PSG match. Maybe the coach can rest Vinicius and Benzema for a few matches.
We have to take into account that, looking only at the squad of each team, we would say that PSG has better players and that could be an advantage. But with Real Madrid being able to better manage the squad before the match against PSG, give them better skills to play the game.
No match is the same but the formation is different between PSG vs Madrid I think both sides will arrange the players before the match starts and actually it is difficult to predict.
I think a lot of people will dominate at PSG because they have so many squads but for me still thinking like that is not a good thing and Madrid also have the same game when on the pitch with the big teams.
Moreover, Real Madrid has experience as the defending champion with many titles.