Some horror tackles on the player on his debut in Brazil's match against Bolivia means he might have to rest. Although I still haven't found any news about Gabriel's current condition but the possibility of him resting for a few weeks is still possible and this could be a problem for Arsenal who are ready with some matches and a busy schedule.
Arsenal's coach Arteta was already starting games without him this season, so he will be able to adjust for the time being hopefully the injury is not going to be a long one. Kiwior will most likely be the one to start against Everton. Everton have had a bad start to the season, they may want to change it when they play against Arsenal.
Arteta's biggest hopes is that he will not have more players injured in this international duty.
Gabriel Mangalas played an important role in Arsenal’s match against Manchester United; he was able to defend the match well and also stop Manchester United’s new striker Rasmus Hojlund because he is very good, and Ten Hag brought him to cause problems for Arsenal defenders so that Man United could take advantage and win the match.
He also played his role perfectly by making sure Garnacho was in an offside position; otherwise, the goal could have counted.
With all these, I think Arsenal will miss him in these matches against Everton, Tottenham, and their first Champions League match if he is confirmed injured due to the horror tackle in yesterday’s match.