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Honestly, I don't think Real Madrid can beat Barcelona because, objectively, Barcelona is stronger now, and the match against Atletico showed that Real Madrid's defense still has many weaknesses. And before El Clasico, Real Madrid still has a match against Villarreal, who are currently the third team in La Liga with 16 points. I think that, despite this being a home game for Real Madrid, beating such an opponent will be a challenge. So, I think Barcelona's advantage can only increase in the coming rounds.
It's clear that Real Madrid defense was in disarray when they were humiliated by Atletico, Xabi Alonso must immediately find a solution in the defensive area. I don't understand what Real Madrid defenders were doing in such an important match, they made so many mistakes that they conceded 5 goals in that game.
Real Madrid under Xabi Alonso still looked confused when facing big teams, they only made passes but their attacks were completely ineffective, despite the consecutive wins they had achieved in previous matches, but when facing a stronger team they did not look aggressive at all in attack. While Barcelona has been thoroughly tested under Hansi Flick, and several new signings have also made significant contributions to the team, Real Madrid may find it difficult to face Barcelona if their defensive strength is not improved immediately.