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.
Last week when Arsenal faced Manchester United he played until the end and his performance was very good and of course this is a big loss for Arsenal.
I think looking at the conditions now we might see Saliba with Ben White.
As for Jakub Kiwior, he can be in that position but looking at his current condition I think he will alternate with Tomiyasu or Zinchenko in the wing-back position because they also have an opening there considering Timber is injured.
Arsenal's defense may still be quite weak now but they must try to anticipate that so that their performance is stable. Against Everton I'm still confident for 3 points just that the tough opponents PSV in the Champions League and Tottenham in the EPL after that are troublesome.