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Barcelona should focus on getting a good defender may one or two because they where very bad going to the back and that contributed to them losing out in the champions League so Barcelona should go into the transfer market and look for good defenders to strengthen their back line.
I think that Barcelona has little problems in their team because the midfield and their attack looks solid and good to go because of the type of players that are playing the the positions
That's right, Hansi Flick really needs to strengthen his defense, last season they conceded 39 goals in La Liga. For the midfield and front line, I think Barcelona currently has very good players. So I think Hansi Flick only needs to strengthen his second tier players for those two areas and it's better to focus on fixing his defense, there's no need to worry about the front line, because we can see last season they performed very productively by scoring 102 goals in one season. Barcelona might have to reconsider their plan to recruit Nico Williams, because maybe the transfer will spend almost all of their budget in the summer.