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This is actually coming from the imagination of @Helena Yu but there is a deep truth in this prediction seeing the current squad of the Real Madrid team for next season, most times the quality players in a team is used to determine the performance of the team in a season and regardless of the season not yet started, Real Madrid has had one of the best and biggest signing of the season which means they are already prepared to win the champions league again since they added another weapon to their team despite having a very good team.
Manchester City, Arsenal and the other teams were not underestimated but let's face reality I don't think the other teams will be able to withstand the current squad of the Madrid team next season, there's Mbappe, Vinicous Junior, Jude Bellingham, Rodrygo and others which is already enough to defeat any team in the world I wonder what the other teams will be expecting when they play against a team like Madrid so personally I think this imagination is coming to reality because Real Madrid has the advantage of winning the champions league next season.
If every team that had a squad like Real Madrid was guaranteed to win the title every season, then we would definitely find them dominating titles in all competitions. Of course we never know what will happen to Real Madrid next season regardless of the players in the squad, obviously it really depends on their performance on the pitch.
Real Madrid is still very likely to fail to defend its title next season if other teams can do better. Competition will be very tight between the teams that qualify, so of course it won't be as easy as we imagined today. We have seen Real Madrid almost failed by Leipzig and Manchester City in the last 16 and quarter-finals last season, so perhaps experiences like that could be used as a reason why Real Madrid and all the other teams are not guaranteed to win the title.