The worst thing is done by Dortmund where they always sell their star players, such as releasing Bellingham to Real Madrid. That's why their performance will not always appear at its best in every season. In fact, I think they will not be able to compete at the top this season because other teams are stronger than them, such as Leverkusen and Leipzig. So, this season we have seen Dortmund having difficulty balancing their game because in the previous two matches they failed to get full points. Maybe Bellingham departure will have a big impact on their performance this season. Well, if we talk about the UCL, Dortmund certainly have quite tough opponents in the group phase and I'm sure big obstacles will make it difficult for them to provide competition to qualify for the next round.
Dortmund needs to do that caused by it's not financially good like bayern. The team needs to use it as a business to keep the club running without getting financial problem since DFL was not allowing the abroad investors to invest their money in bundesliga.
Let's see what's gonna happen with during the competition. Even though Dortmund sold many players to another club, they still managed to get to second place, which is better than Leipzig or Leverkusen.
We shall not judge dortmund's performance easily. I would not be denying if some players like haller needs more time to play in the club.
Dortmund will able to find its rythm again with the running of season.