For Dortmund, this season might be even worse than the previous one when they finished 5th. They are always considered as a serious contender for the Bundesliga championship but after only 13 rounds, the gap between Bayern and Dortmund is already 12 points. So looks like the most Dortmund can hope for this season is to end up within the top 4, which won't be easy as they just got overtaken by Wolfsburg (who are on 5 wins streak).
Dortmund have many good players like Nmecha, Schlotterbeck, Kobel, Gittens, Adeyemi and Guirassy.
Felix Nmecha is growing more and more, Top clubs in England are watching him, and he also has a market there, but the player wants to stay at Dortmund for now, and Borussia Dortmund has no plans to sell him.
And Guirassy is a class player, I don't think Dortmund will look for a new striker next year.
The problem is with the coach, Sahin still can't maximize the potential of the players they have. IMO
All eyes will be on Wednesday when Dortmund hosts Barca. After Barca comes Hoffenheim and then Wolfsburg. So, good luck to Dortmund.