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.
Real Madrid are no longer on the phase with Barcelona, alot have changed and watching them suffering in all angles. Hansi Flick is appointed as the new headcoach of Barcelona and we should prepare for the new management of the new coach. Barcelona have been going through alot lately with their static poor performance in La Liga and other major tournaments. The Blaugrana needs to rise back to their heels if and the only way to do that is simply making pushing efforts for improvement and signing new players.
At least if you look at Madrid's chaotic condition a few seasons ago with Barcelona at this time they are clearly different in financial terms.
Madrid had an era where they were a bit down after the Champions League hatrick where there was a situation that did not match the expected performance for Madrid but after Ancelotti came and Madrid had financial strength they returned to where they are today and that is obviously a little difficult for Barcelona to replicate.
Barcelona are still one of the big clubs but their finances don't really allow them to compete because for now they can only look for young players or indeed free players so that their transfers are not burdensome given their difficult financial conditions.
Increasingly it seems that Barcelona is increasingly troubled by the conditions that occur for them because indeed they are required to play well with competition as a big club but with limited finances that make coaches and players have great pressure for this.