Let's have a look at Dortmund squad...
They made LB and RB signings this summer and the positions look okay now. When it comes to CB, not so much... Because Schlotterbeck isn't expected to recover from his injury before October.

Niko Kovac should handle the situation depending on Süle's physical condition. You know he gained lots of weight earlier. Lastly, they need an immediate LW signing. Duranville is the only option after selling Gittens.