For Arsenal it's a tough test. Last season they haven't felt a moment like this one. Under the circumstances of a busy schedule in some competitions. So there should be an adjustment, and that has passed Arsenal in a few seasons. So Arteta must be ready to rotate players. Maybe he will fight a lot of fatigue and injury. But perhaps the selection of young players is part of the strategy for this season. With this strategy, maybe their stamina and strength are still good enough to fight with a busy schedule.
I think it will not be a big problem for arsenal facing a heavy Schedule in the next season as they can rotate players to focus on important matches for them. Arsenal success in returning to the Champions League will certainly be used as best as possible for Arteta to do his best in every game they play.
3 representatives from the EPL indeed the three of them were absent in the previous season in the Champions League and this season they will try to do their best in the moment of every match they play in the Champions League such as Newcastle United, Manchester United and Arsenal. Only Manchester City, maybe they don't think too much about this because they are used to a busy schedule.