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I think Hansi Flick still needs to improve Barcelona defense to prevent them from conceding so many goals in a single match next season. As for the forward line, Hansi Flick likely won't have any concerns, Raphinha, Yamal, and Lewandowski will be able to live up to expectations. With Rashford arrival, Barcelona attack will certainly be even sharper.
We realize that the race for trophies will likely be tougher, as Real Madrid appears to be actively overhauling its squad. Barcelona will have to work harder to retain the trophy, and they may not be as lucky as last season when facing Real Madrid in El Clasico.
Hansi Flick has enough defenders to start next season well, but their performance isn't guaranteed to go according to plan. Barcelona has already brought in an additional goalkeeper to bolster their porous defense, while Rashford is the only other new arrival on loan. All the other defenders are in good form, and I think Barcelona is ready to maintain their performance next season. Problems may arise if their performances don't live up to expectations, and then they'll need to find other solutions in the next transfer window.