Borussia Dortmund are facing a battle for Bundesliga survival, sporting director Michael Zorc has admitted.

Zorc's comments came after the weekend's 2-0 defeat at Frankfurt left the 2013 Champions League finalists at the foot of the table for the first time in 29 years.

Following BVB's eighth defeat in 13 games, he told reporters: "It's just like Lindenstrasse [one of Germany's most popular soap operas]. It's on every week.

"We are stuck in a relegation battle. In the last few weeks, we paid attention to the gap to the top -- but that's over now."