Sometimes international breaks can be very detrimental for several clubs whose players play for their respective national teams. Now, Magalhaes' condition will be a big concern for Arsenal manager, Mikel Arteta, because they also have another player who was injured, namely Timber, at the start of the season. Apart from that, Partey also suffered an injury. not a good situation for Arteta, considering their targets for this season.
If Gabriel later has to undergo a recovery process related to his knee problem, then the Gunners will automatically experience a defensive line crisis due to injury. With the injuries to several Arsenal defense players, Arteta has to take advantage of the available players and even though Arteta still has other options that he can rely on, having three players injured will be very detrimental to Arteta. Like it or not, Arteta initially had several plans or strategies, he had to reorganize them to maximize his squad. Nevertheless, I hope Arteta can find a solution for his squad. and does not have a big impact on the team's overall performance. Week 5, their opponent is Everton. At least, if Gabriel Magalhaes is absent, it will not have a big impact on the Gunners' defense.
Things could begin to get bad at Arsenal, with this current news and I know their coach Arteta would be very worried at the moment, because like you said this could hinder their target this season and they don't have to drop any points if they need to meet up theirfore they need their players to be fit so as to have a better competition, after Thomas Partey and and jurrien Timber this is the third injury that involves one of their injury players, and currently Arteta would be hoping his player doesn't return from International duty with a very serious injury.
This could affect their success rate this season because though they could easily get past Everton who're in a very poor form this season, but their Next match and the one after is what they should be worried about, PSV is one of the top clubs at Netherlands and they got good players and the club is known for it's regularly participation in the Champions League so they got good experience and also Tottenham are currently in form with a good coach with experience and won't be very easy to beat, to face these two clubs Arteta would need the help of his key players in all positions, too bad they lost Timber, Partey, and Gabriel to injury, this is a good news for their defence line.