for now, barcelona is one of the clubs with the best squad in the world so if they intend to buy players again, it's just a waste. What Xavi has to do right now is focus on making the current squad work very effectively. they must be able to at least win a domestic trophy in the following season and the UCL is one of the trophies that Barcelona must target.
Really, best club in what way, then where do you place manchester city single-handedly won three different trophies the FA Cup and the champions league, and very soon the premier league then what now can you say about Barcelona still being the best club? they are just lucky they were able to gather enough points if not Madrid would have to threaten their winning the La Liga.
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The best in the world 
I think Barcelona is only the best team in La Liga not in the world because the best team in the world for the season that has ended is the English team that won the UCL two days ago. So how can you say that Barcelona is the best team in the world if Barcelona still failed in the UCL and have to try again next season. After all, the nickname of the best team in the world is a team that can get three trophies like what Manchester City got this past season. Not just one trophy, namely in La Liga.
I think Barcelona is only the best team in La Liga not in the world because the best team in the world for the season that has ended is the English team that won the UCL two days ago. So how can you say that Barcelona is the best team in the world if Barcelona still failed in the UCL and have to try again next season. After all, the nickname of the best team in the world is a team that can get three trophies like what Manchester City got this past season. Not just one trophy, namely in La Liga.That was the best remark he could have made—the best in La Liga even for the upcoming season, as I don't believe Barcelona will advance past winning the league this year. Although Barcelona did not do well even in the Champions League, I think by now he would have changed his opinion that they are not the best club. I wish Barcelona luck for the upcoming season and hope they don't lose La Liga too I don't see Barcelona improving like the other clubs. their previous games in the champions league were not encouraging at all.