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Very bad, Gavi is a talented young player but yes I heard him injury was very serious, which required him to be absent for a long time. Although I think Xavi seems to have other options because in the last match he didn't use Gavi services, but losing players due to injury is clearly bad for them, especially also Gavi is a key player for Xavi. Every international break there are always injuries, but yes this international break is worst, previously we heard injury player Camavinga Ter Stegen Vini etc.
Gavi's injury is basically not too bad for Barcelona because they have several other midfielders ready to appear. Apart from Gavi, Barcelona will also lose Marc-André ter Stegen, Sergi Roberto and Frenkie de Jong due to injury, but Barcelona is lucky because Pedri has recovered from his long injury. Frenkie de Jong will also be back in a few days and I don't think Barcelona will be hit too hard by Gavi's injury.
Marc-André ter Stegen's injury is much more worrying because we all know that he is Barcelona's last wall of defense when other defensive players fail to anticipate the opponent's attacks. Xavi is aware of that and he seems to have no other choice but to play Inaki Pena while Stegen is injured. The international break is a scary project for clubs and players because there is the possibility of injuries that will keep them out for a long time like what Gavi experienced. Not only Barcelona, Real Madrid also experienced the impact of this international break.