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It seems like a coach like Hansi Flick won't be able to do much if he isn't given a lot of freedom in determining the players he wants and of course Barcelona knows that they have to prepare fresh funds for Hansi Flick to shop for the players he targets. The reason is that Hansi Flick is not a native Spanish coach and as we know, he certainly won't feel comfortable if he only relies on the available players or only relies on players from the La Masia academy.
I think there is a need for a comprehensive approach before the season starts and this is usually done from the direction of the players who will enter as starters later and in my opinion Barcelona still lacks quality players to be able to compete with its eternal rival, namely Real Madrid. So in the end, Barcelona will not be able to completely dominate La Liga and they could fail to win the La Liga title from Real Madrid if there is no refreshment in their squad.
An agreement between Barcelona and Hansi Flick has been made and Hansi Flick should have known what Barcelona's financial situation was before he signed the contract. Barcelona is not doing well financially and this has been Xavi's complaint in building a competitive squad for Barcelona. Xavi was fired for commenting on the club's financial problems, so Hansi Flick seems to know what he has to do unless Barcelona management promises him something.
Selling several young players and main players should be an option for Barcelona to get fresh funds. The funds from the sale can be used to bring in several targeted players who support Hansi Flick's game plans at Barcelona next season. I'm not sure how many players will be on the sale list, but maybe that will be the only option that Barcelona will make to strengthen their team next season.