I see that Arsenal is solving this problem, now it seems that Arsenal is making several transfers that allow for an equal quality between the main and reserve players so that if there is a player rotation it will not have a significant effect on the team's performance.
I think it's very likely that Arsenal will do well in the Champions League next season, the quality of this team is increasing now and they deserve to be reckoned with.
Arsenal really shouldn't be underestimated next season, especially in the Champions League because Arsenal themselves are also very aware that they still have to improve on existing deficiencies to be able to wade through an even greater next season. And not only in the Champions League, Arsenal must be taken into account, but also in the Premier League must also be considered from the start of the season, because Arsenal will try to be consistent from the start of the season to fight for the title next season.
Theoretically, Arsenal have become quite a competitive team. although I think they still need to sign a centre-forward who is hungry for goals, but at least now Artera's team should be stronger than last season. Arsenal have deepened their squad by bringing in several new arrivals, they are ready to welcome the new season. although this team is almost dominated by a young squad, however, it should not be underestimated. we can see how they almost won the domestic league trophy, even though in the end the Gunners squad failed to maintain the consistency of their performance. at least, whoever the team that will be Arsenal's opponent later. they have to be ready, because this team can surprise.
One more thing, which we should not underestimate. So far, United have not brought in many players. but that does not mean, this team is not competitive. because after all, Manchester Unitid should not be underestimated. the proof, with the available squad. they were able to finish in 3rd place in the Premier League standings. it could be that if Ten Hag's squad doesn't have problems with injured players, they can go as far as they can in this competition. after all, they have a coach who is no less intelligent like Pep Guardiola. To be honest, I can't wait to see the competition begin.