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Fati was also injured and lacked game time from Xavi. Freeing him to Brighton is a way to get fit and return back to Barcelona. He is no doubt one of Barcelona finest creators and creative players after Messi left. Injuries has denied him the opportunity to impress Xavi, so it is good he is around Brighton coach who knows how to work with young players that are creative.
Barcelona had Ferran Torres when things for Barcelona was difficult. With hesitation he left Man city for Barcelona. Xavi trust him even if he has not performed well this season.
Lewandowski is the finest and best option they have in attack, his absence will lead to reduce goals scored for Barcelona.
Barcelona loaned Ansu Fati to Brighton not only to get him fitter and get playing time, but they did it to reduce expenses and also so that several other players could be registered. Considering that Barcelona has to do this for financial reasons, Fati must be willing to take his suitcase and get better experience at another team before he returns to Barcelona.
So far Barcelona has no shortage of wingers, but they have lost many of their best midfielders due to injury. Pedri and De Jong are two important players missing from several of Barcelona's matches so far, and that has disrupted Barcelona's performance and has also cost them in several matches. Barcelona's squad will be better when all the injured players recover, but either way Barcelona has plenty of young talent to help the team maintain its form.