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Dortmund's management is very experienced. And they often sell the best player in their squad. However, their performance remains fairly stable. But it is not the case that their performance will be stable every season. Bellingham was a very important player for Dortmund. And it was Bellingham's performances that kept Dortmund's midfield and attack stable last season. Dortmund's performance has deteriorated since Bellingham's departure this season. Another reason for Dortmund's poor performance is Dortmund's weak attack during the season. Sebastien Haller is not playing well. Dortmund have high expectations from Haller. But he could not score a single goal or assist in three matches. This is one of the reasons for the deterioration of Dortmund's performance.
well, in the end this season Dortmund has appeared unstable and its performance has greatly decreased since selling reliable players like Bellingham Dortmund must try to build new talents again to be able to immediately improve stable performance this season because even if they do not have reliable players at least Dortmund should not have a decline performance that has been very clear in the last few periods of matches and currently Dortmund has to compete in the UCL preliminary round which is a pressure for Dortmund to improve performance otherwise this team will lose another chance.
and to be honest even so I'm still not sure whether Dortmund will be able to compete with other teams in group F while Dortmund will have to compete with PSG, Milan and Newcastle who are currently in a very strong state.
Dortmund has been like that for a long time, they will never care about a decline in performance, and because no other Bundeliga team has risen so they remain safe at the top of the standings (below Bayern) because there is no significant competition from other teams, so I think this season it will remain like that.
And regarding the competition in the UCL, Dortmund will join the most difficult group with Newcastle, PSG and AC Milan. I think with Dortmund's current performance it seems like there is no chance for them to qualify from this group.