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Xavi has done incredibly at Barcelona since his arrival at the club,and I can say all this results are achieved simply because he loved Barca and wanted the best for the team.During his time as a player in the club,he and Iniesta were the best midfielders in the world.They knew how to control the midfield than any other team as at that time.Now he is made the coach,and he has proved to them that he is capable of doing anything for the club.He has won their league with the Young's palers at the club,he has a dream of winning the Uefa Champions league next season,and I believe if the club management signs quality players that are experienced enough,they can win the Champions league.
You are right, Xavi has done a great job as coach of Barcelona. Xavi knows what he has to do at Barcelona and he knows what needs to change. The locker room gets better because of it, it's the best way to start a big plan for the success of his team.
Barcelona have so far managed to prove that they are not lacking in quality so one should not underestimate them. Of course it is true that Barcelona are not better in the Champions League, but when the season changes the new hope will be different. I think Xavi has laid out a good plan for the Champions League and domestic competitions next season, even if I would say Barcelona is still too far from perfect.