Luckily, I read the news that some of their players will return from their injuries in El Classico later, such as Courtois and Miliato who are scheduled to be ready on October 10th. So, at least this is much better than the current condition.
Looking at the current condition of Real Madrid team doesn't give anyone the expression that they will be able to win El Clasico, but we might see a different thing because no one knows Ancelotti plans and strategy that he will come up with on the match day. Ancelotti should not be underestimated because he knows how to win important matches. Carvajal might be out and his absence will definitely bs felt but the substitute is the only option and he might perform better than expected. 
hahahaBut it's true, especially since Barcelona's performance is currently on fire and in very good condition, along with Hansi Flick and especially Lewy and Yamal who are really on fire in their performance. So, this will again be a fairly predictable match, and as usual, we don't even know the final result until the final whistle is clearly blown.
Oh by the way, this is related to the new Club World Cup, it seems that there are talks between La Liga and FIFA regarding the event. Because FIFA has decided and they have emphasized it. It's just that the clubs in La Liga do not agree with it. If this really happens and must be followed without any right to refuse, then just imagine how tired and dense the matches of these players will be in the future, now it's already this dense,
Source: President of La Liga speaks about preparing a lawsuit against FIFA.