It is unlikely that Flick will be able to increase anything, since he refused new transfers, given the financial situation of the club. Injuries will happen in any case, and of course Real Madrid have much greater depth in the squad and the Real bench is very high quality, I think Real could make another very decent team with players on the bench. If Flick faces multiple injuries, it will most likely be an unfixable situation for Barcelona, but there is no need to think ahead, problems need to be solved as they arise. Barcelona has a good squad that can compete even with Real Madrid.
The club's financial situation is the most pressing issue currently at Barcelona. Because this club is currently struggling to restore its financial condition so that it returns to a more stable condition. So it is not surprising that last season Barcelona was not actively shopping for expensive new players. And very different from previous seasons. So I also don't feel surprised if this season Barcelona still doesn't make much movement in the transfer market. because they are indeed struggling for financial improvement. Hansi Flick is actually targeting several new players that he wants to bring in. And currently Barcelona itself is also starting to target Nico Williams from Athletic Club. But the condition of Barcelona's second tier players is not very good. This is different from Real Madrid, which already has a main squad and a second tier whose quality is beyond doubt. Real Madrid can be said to be the club most prepared for next season.