Barcelona will be more focused on preparing for the semi-finals in the Champions League so the coach will definitely make some rotations and if the results are beyond expectations because they will draw in the next match then this scenario can be used well by Real Madrid so they can chase points in the crucial match when the two meet.
This possibility can still happen because with the tight schedule now they could save their energy with some rotation so that other competitions that are prioritized run well, but what I see from the conditions that Barcelona has lived at this time, Flick is still someone who is greedy where they will still maximize all the opportunities they have in all competitions that are lived.
But for me something like that is also not a mistake because as long as the results continue to go according to plan then it is not a problem but as much as possible Flick must remain careful because trying to do the best in all competitions that are lived can make fitness a little disturbed so he must be more able to manage players well so that their performance remains consistent and even feared but on the other hand they also do not export players harder.