But it is obvious that Dortmund won't be able to keep him after the end of this season. Dortmund need him definitely. But it won't be easy for them to keep a great striker like him here for a longer time.
The poker has already begun. According to several media reports, Dortmund seems to be near about a commitment of Karim Adeyemi of Salzburg. Apparently, it is only about the amount of the transfer fee. Adeyemi is certainly talented enough to replace Haaland. For the transfer fee of Haaland, Dortmund could then probably make a second striker transfer.
I also read yesterday that Dortmund is willing to double Haalands salary if he agrees to stay in Dortmund for another year or two after this season, but i strongly doubt that this makes him stay because i think he does not see a lot of perspective at the moment the way that Dortmund is playing. If they are really doubling the salary of Haaland then i would guess that would the other players in the squad also extremely unhappy Haaland would then get around 16 Million € per year which is more than any other player at Dortmund. It's better two have a squad of good and happy players then a squad of one superstar and the rest of the team feels neglected.