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The challenges faced by Ancelotti this season are actually more complicated, where Real Madrid started the season with a number of injured players. The departure of several players such as Toni Kroos, Nacho, and Joselu also made Ancelotti have to think harder, and build new players to be able to adapt to the team is also another challenge. Those are some of the reasons why Real Madrid have performed a little unstable this season, and it must be admitted that it is not easy to get through the transition period.
Ancelotti is indeed quite lucky because he has quality second-string players, so he is able to support the team performance to remain in top form. With his managerial experience, Ancelotti can certainly be relied on in various situations, and in my opinion the Italian manager has faced it quite often.
The match against Celta Vigo is very important to win, where Real Madrid will face Dortmund and Barcelona after that. I am sure that Ancelotti is currently preparing his best strategy, using the international break to evaluate Real Madrid weaknesses in the last few matches.
Well, Joselu didn't make that much of a difference and Nacho should be replaceable. Kroos is probably the only player who can't immediately be substituted by the players that are there already. But then again they were able to get Mbappe and I think every coach in the world would have said that the team didn't become any weaker when a few players leave but in return you can play with Mbappe from now on.
Seriously, look at their offense consisting of Mbappe, Vinicius Junior and Rodrigo and some others who can play offensively like Bellingham. They have a strong team that still is trying to find their best setup. But Real Madrid usually gets better with time and this is what I expect as well.