https://onefootball.com/en/news/borussia-dortmund-will-let-youssoufa-moukoko-and-sebastien-haller-leave-in-the-summer-for-reasonable-offers-39603442
Dortmund is ready to let them go. I see that Dortmund has a problem of having too many strikers in the squad. So some of them are going to feel uneasy and want to leave. Of course, because they are in danger of not getting good enough playing time. So it makes sense for the career of those players to leave. Now I hope that it does not cause too much problems because this situation can be problematic when the players who are not feeling settled, cannot leave. There is a chance that they are bringing in all these strikers so that they can have good power in the attacking line and also have good depth in the squad. And that is going to be very useful if players actually get injured. But if all the players are healthy they are going to have a problem giving all of them good enough playing time. It’s better to let a player go instead of having him in the squad unsettled.
To be honest, I don't really follow the players who left Dortmund, except for Fullkrug who joined West Ham. That's why when Dortmund brings in another striker other than Guirassy, the opportunities for Haller and Moukoko will be even more limited. Which means, Haller and Moukoko have the potential to want to leave Signal Iduna Park. In addition, Sebastien Haller's performance was really messy last season. He barely scored a goal at all, that's why he only played 14 matches. Moukoko, he was injured, but at least he scored 5 goals from a total of 20 matches. However, with the arrival of Guirassy and Beier, the opportunity to play him will be very limited. Moreover, if the two newcomers that BVB brought in are able to perform optimally, their opportunities to play are getting smaller. It would be very reasonable, if previously Moukoko had a personal agreement with the French League team, Marseille. In addition, I have not seen Nuri Sahin's gameplay leading to much better progress. However, it is reasonable, he is still trying to experiment and rotate some of his players. Dortmund are just counting the days until they play their match, and the future of Haller and Moukoko is still unclear, whether they will leave or stay.