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Is it possible, only I judge Hansi Flick's success at Bayern Munich in the past only because at that time Bayern Munich had great players in the squad. After all, if for example Bayern Munich did not have great players, I am sure Hansi Flick would have failed. Therefore, even though Barcelona has appointed Hansi Flick as their new coach, but I believe Hansi Flick will not be able to make Barcelona good and strong. Moreover, the financial problems at Barcelona will certainly make the prospect of building the team will not go well. Moreover, Real Madrid is still successful with its young players, so of course Real Madrid will be difficult to conquer in the long run, because Real Madrid has great young players.
The financial crisis factor is the main reason that could prevent Hansi Flick from winning a trophy for Barcelona, even the best coach of Pep Guardiola caliber would still have difficulty if faced with the same situation. Moreover, Barcelona has to compete with Madrid which has better squad depth, it is clearly not an easy job for Hansi Flick in his first season.
Even the competition in the top four standings next season will be more competitive, it is possible that a dark horse team like Girona will increase, it could be another challenge for the Blaugrana. Transfer policy is the most important part of Hansi Flick journey next season, where he must be really wise in recruiting or releasing players.
I don't think Hansi Flick can do much in the transfer window, meaning he has to make full use of Xavi legacy players. However, if Barcelona avoids the storm of injuries, with the squad it currently has, perhaps it can make it easier for Hansi Flick to lead Barcelona to compete at the top of the La Liga standings next season. But still, it wasn't enough to put pressure on Madrid.