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I think it'll be if we all should praise Xavi Hernandez more than we point out his weakness as the manager of FC Barcelona because he's done exceptionally well for the Catalan club than many had expected
Winning the Spanish La Liga title last season ahead of a team like the star-studded Real Madrid squad is a big example of how well Xavi have transformed this Barcelona since he took over and still showing signs of improvement in the coming seasons
It is undeniable fact, indeed Barcelona performance improvement when it was take over by Xavi their having a good progress, but when Xavi plays against big clubs outside La Liga, he doesn't have perfect tactics. Today also in a friendly match against Arsenal, Xavi lost tactically although it was a friendly match but Barcelona shouldn't lose. But anyway I shouldn't underestimate him, Xavi might be able to make a surprise in the UCL later because now the Barcelona squad have a new better players.