Expectations for Ten Hag in my opinion will not be too high, but his chances of winning a trophy in his first season are still open. As we know, Leverkusen is in a transition period, and Ten Hag must try to speed up his adaptation process. Of course, Bayern Munich is the team that is more favored in the competition, and it will not be easy to break their dominance. I think Leverkusen won't have too much trouble if they aim for a Champions League zone, and who knows, Ten Hag will be lucky even though he is currently very underestimated. Besides that, I hope Dortmund will be involved with Leverkusen in challenging Bayern Munich dominance.
This is going to be plus point for Eric Ten Hag he is not going to have any pressure while he is starting from scratch and things could be also favorable for him just because of these few things I am sure he will be able to have good start with Bayer Leverkusen even he can go through for challenging top teams.
After exit of Xabi Alonso and transfer of Florian Wirtz they are going to be had problems, but few new signings can make this good for them which will also allow Eric Ten Hag to have players which will be ok for his strategy and he will be able to keep things on balance Champions League is going to be bonus. Most chances Bayern Munich will be keep dominance still Borussia Dortmund and Bayer Leverkusen will be tried their best for having challenges which keep Bundesliga interesting in coming season.