Haaland could break records when he will be signed by another club. Concerning his injuries, that is a little bit of a factor here I would say as he did miss quite some games in the last two years. He recovers quickly, but had muscular problems a couple of times if I remember correctly.
Haaland is currently very hot topic for transfer, and we have very few clubs those can afford player like this right now first is Manchester City and second is Real Madrid so lets see who is going to jump into this but most chances he is going to stay in Dortmund for some more time because Manchester City first choice is Kane, and he can leave Tottenham for this on other side Real Madrid is also looking for Mbappe instead of Haaland, so they will give first try to this, and surely they will bring him here just because of this I have feeling most chances he is going to stay in Germany instead of going in some other better club.
I just read the news and it seems that Dortmund is now planning to double up his salary if he stays for one more season. I think the plan makes sense. If Haaland leaves, they would have to buy another offender anyway. So why not pay Haaland 20 million instead of 10 million for one season and make sure that they get back on track again next season with Haaland as a part of the squad? If Haaland leaves after this season it could be another ugly year for Dortmund. They should indeed try everything they can to keep him in Dortmund.