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Although Barcelona won this match, the Barcelona team was not able to win by a large margin. By winning all 7 matches, the Barcelona team has kept the top position in the table. However, several key midfielders in Barcelona's squad have suffered injuries. So Barcelona's midfield is a bit shaky at the moment. Even though Barcelona won yesterday's match, their midfield weakness is well understood. So we will probably see a bit of a slow performance from Barcelona in the next few matches. However, Barcelona coach Hansi Flick is an experienced coach. With Flick's help, maybe Barcelona will be able to continue their winning streak.
No, I don't really agree with your assumption about Barcelona's weakness in midfield. I watched the match because I was curious about their performance especially in maintaining a winning trend, so what I found was that their overall performance was very good. The back line, midfield and striker are very attractive in building attacks, even if I find some players don't play in their main positions.
Barcelona didn't win the match easily, but they were very unlucky with some of their big chances. Lewandowski missed several big chances, Lamine Yamal and Raphinha too, but the 1-0 win was more than enough to seal victory in week 7. Only Barcelona have completely wiped out all the points contested in the last 7 weeks in La Liga, while Real Madrid slowed down a bit.