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Apert from adapting to a new coach, Barcelona is getting choked with alot of injuries and once a player gets an injury there's a decrease olin form which my take Time to recover apert from recovering from the injury sustained in the first place..
Adapting to the new coach might not be as expected seriously., take man City as example , although a good coach will get his team to adapt with in a very short period of time and Pep is a good coach , Flick is also a good coach so I think we should expect fast adaption.
Barcelona has appointed Thiago Alcantara as Hansi Flick's assistant, his presence among the Barcelona coaching staff will make it easier for the players to adapt to the strategies used by Hansi Flick because they are no longer hampered by the language factor. Hansi Flick is a great coach and Barcelona on average has great players, it is not difficult for the two of them to understand each other.
Maybe in his first season he will experience a few difficulties, but he will overcome them based on the experience he had with the previous team. Hansi Flick and Guardiola are different types of coaches, but Barcelona will not throw away its identity, which always applies the Tiki Taka playing style even though it is led by someone from outside Barcelona.