I'm so sorry about Haller, I hope he gets well soon. He was an important player who was paid quite a high wage, of course nothing is more important than health. But it must have been a very difficult situation for the team as well.
There will be a positive development in a short time and he will regain his health, it is also very bad that he had such a cancer at a young age

It's a shame that Haller current condition, after Haaland departure surely Dortmund fans expect quite a lot of Haller right now, but unfortunately the testicular tumor he suffered forced him to undergo medical treatment and it looks like he will need quite a lot of time to rest, the league will start soon again and I think maybe Haller will miss his debut with dortmund in the League later, so it's better now dortmund find another striker to replace him before he fully recovers.
Really the bad news . Haller is at such a young stage of his life and his career is going really good and that he gets cancer is bad. Hopefully he receives his treatment and recovers fast so we can see him on the field. On the other hand Dortmund are in huge troubles because they dont know for how long they wont have a striker.