Pep will want the league done ASAP so we can ignore everything else and just prepare for the final. however, if Chelsea win tonight I think Pep goes full rotation with a Palace lineup and doesn't care about the result just so that Tuchel can't learn anything from that encounter.
We've got 3 weeks until the final, everybody is going to have to play some minutes to keep them ticking over anyway so we can get the job done later against Newcastle or brighton if needs be.
I don't think we need the confidence boost of a win when we will be favourites for the final but if we go full strength against Chelsea after they reach the final and lose its a big psychological blow, if we win its still good analysis for Tuchel to use in an attempt to come up with something to stop us in those 3 weeks inbetween.
If Chelsea go out tonight though then it's a mixture of Palace and Psg and we try wrap the league up early.