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It should not be forgotten that El Classco is a friendly match. Therefore, it would be wrong to think that Real Madrid suffered a heavy defeat against Barcelona. Almost all the players changed and Barcelona won 3-0 after scoring 2 goals in the last minutes. This is good for them, of course, but I don't know if it's enough for La Liga, which is a long marathon.
Of course it was a friendly game, but basically a game taken seriously. We don't just accept defeat against Barcelona without putting up a good fight, but Real Madrid were really unlucky in that match. Therefore, Ancelotti may need to find a good solution for next season so as not to be beaten by Barcelona again in La Liga matches or other competitions. Barcelona has changed because of Xavi even though they will never win over Real Madrid forever.
La Liga is certainly different from friendly matches, but if you believe in the prestige of the two teams in the match, then really it is like an official match to win 3 points for each team. El Clasico is different from other matches regardless of whether it is a friendly match or an official match.
A friendly match is indeed not a strong benchmark to see the true might of both teams. However, the mentality of the players will also have an effect on in friendly matches because this defeat will make them feel like they are under pressure when they meet again in the official Laliga match next season.
Indeed, from what we have watched, Barcelona impressive game has shown the public that they will be able to defend the title next season. So real madrid must be able to overcome the gap that has become a weak point in their squad depth after the series of negative results they got in friendly matches.