Source: https://twitter.com/FabrizioRomano/status/1832029979556655133?t=0wPmU0edTer0ZW-tyi0KKA&s=19
At the beginning of this season, Real Madrid was really unlucky because the list of injuries to their players continued to grow, even though they still had some players they could rely on, but Carlo Anceloti still had to rearrange his strategy, especially since this season they would be busier than previous seasons. The players would experience fatigue and, perhaps, at worst, injury, so the coach had to be smart in rotating players so that they could continue to fight until the end.
Before these players will fully recover from injuries, Real Madrid have to suffer it and they will definitely find it difficult to be winning matches, but if the coach is able to maintain the momentum and keep wining their games before they injured players get back, they will be able to perform well, but if they can’t keep it, they will definitely lose some matches in the group stage because their squad is not complete.
Whatever is the reason, they have to find the problem at the root cause and fix it very quickly, because they can't afford to have a bad season. It's their first year with Mbappe, and fans are expecting a lot from them this season, if they fail to get anything, then it is going to be pretty tough to tell fans to calm down and wait for another year.
Having bad season depends on their preparation, and the management tried their best to keep their former players and they never expect these injuries, but since it has happened they have to work together to get things work before these players will get better. If they have squad depth, they should have no worries.