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The truth is, Barcelona is currently facing financial difficulties in acquiring star players, which is why they are targeting free transfer players like Gundogan. In terms of quality, Gundogan has the potential to fill the void left by Busquets and even surpass his predecessor. His presence at Camp Nou is expected to enhance creativity and increase the number of goals from the midfield.
With Xavi's expert guidance, it is hoped that Gundogan's inclusion in the team will lead Barcelona to become treble winners, just as he recently achieved with Manchester City. Given his wealth of experience, Gundogan shouldn't have much trouble adapting to his new team's playing style.
True, Barcelona has financial problems that have discouraged them from buying more high-value star players. But you need to know, Barcelona can also be successful in this way even though some of its players have had to accept a decrease in salary.
Barcelona have been built in a different way because of financial, but they are still a team that can compete in any competition. Barcelona's proof was last season, even though they didn't sign many expensive players but they managed to win two domestic titles compared to other teams who have strong finances. Barcelona have a lot of quality players, and they are quite stable with some free players.
So far they seem to have found a smart way to increase the quality for their team. When they sign some who have an expired contract they can save a lot of money in that way and consolidate their finances. It is not yet known how many players more they are trying to bring to Barcelona, but they will need a few if they want to attack again. But they do need to improve their overall approach since they are in desperate need for a surplus.