Gavi is an effective player for Barcelona and Xavi was surely counting on this player for the rest of this season. I think Barcelona is even right to start blaming Luis de la Fuente for it because the game against Georgia was not an important game for them to let Gavi play in this match.
Regardless of that, Barcelona can have 30 days to hire another player to take Gavi's place in the team. They just need to prove Gavi is out for four months or more which is not hard and there won't be any financial issues for Barcelona about hiring the new player.
He is a player who is quite relied on by Xavi but however this has happened but why did Luis de la Fuente play this important player when their points are far enough away so it is safe to keep qualifying, but when players have entered the game the country depends on the coach.
What I know is that Gavi will be out for more than 7 months, meaning he won't play until the season is over, which is a shame, now what Xavi is doing to immediately do what is an emergency, maybe buy a player but haven't heard any more news because Gavi's injury was only last night.