Change is needed in every competition but I think Barcelona doesn't need to make changes for now because I think their squad is perfect enough to compete next season, Hansi Flick just needs to maintain what he did last season, but maybe the small shortcomings that need to be fixed are on the defense side because even though their defense is not bad sometimes the players like to make mistakes that result in defeat.
How do you look at the Barcelona squad and say it's perfect? An injury to Balde last season was the reason they got knocked out of the Champions League, because Balde acts as their LB and LW. Raphinha plays more of a central role, so he's not a LW. That means they really need to fill that position, and that is why they made Nico a priority.
Also in defence, they need a RB, because as good as Kounde is on the right, that's not his natural position and he can't join the attack well. They need a natural RB, if possible, a RB who can also play as a LB so he can be a backup for Balde.
If it were up to me, they should go for a striker too because Lewandoski is old. He scored a lot of goals last season, but he also has a lot of weaknesses and as he's getting older, I feel he might be worst next season, but that nit a priority.
Btw I haven't heard the latest news regarding the purchase of Nico, has Barcelona not found common ground with Athletic Bilbao?
I read tat Barcelona wants to pay the release clause on the 31st of this month. I think it has something to do with their financial year or whatever. As long as Nico has agreed to join Barcelona, there is nothing Bilbao can do to stop the deal because Barcelona will simply pay the release cluasue and take the player.