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Barcelona's performance in the Champions League last season was disrupted because several players were injured. Their defense was a mess and it looked very different when they played for La Liga. Xavi tends to trust Alonso as a left-back compared to Balde or Jordi Alba, it's also a form of mistake because Alonso is not in good form as a newcomer.
I hope Xavi can really learn from Barcelona's mistakes and his strategy in the last two seasons in the Champions League, so he should have a good plan for next season's Champions League. But still, I don't think Barcelona has a big chance to win the Champions League title soon.
I just want to add, before that Xavi only used Busquets. after a series of defeats in the Champions League, plus several injured players. Xavi has difficulty getting around these conditions. after being eliminated in the Champions League, Xavi's focus was only on La Liga. which in the end, he found a new system that uses Busquets and De Jong as a pivot. although it cannot be said to be ideal and solid, it seems that this combination has changed Barcelona's game. Xavi found the rhythm of the game for his team, plus the players who were injured recovered to return to their respective positions. as a result, Barcelona can win the La Liga trophy. at least, a special gift for them even though they can't yet be categorized as a very strong team.
In this summer window, Barcelona brought in several newcomers. at least, add depth to the squad of his care team. it's just that some players, such as Oriol Romeu, haven't found their rhythm yet. it could be, because Xavi is trying to experiment with his new system. however, this team should be tougher than last season. unfortunately, Dembele will leave even though Barcelona still have a replacement. my estimation, at least Barcelona should be able to qualify from the round of the top 16. yes, even that depends on which team will be their opponent later. let's wait, and I just hope they show their best game.