Borussia Dortmund captain Mats Hummels concedes it is really difficult to find explanations for his side s woeful Bundesliga form.
Dortmund have not finished outside the top two in Germany s top flight since 2010, but currently sit 15th having managed only two wins this term.
Jurgen Klopp s men have claimed just one point from their last six outings and suffered a fourth defeat in succession on Saturday when losing 1-0 to Hannover.
Hiroshi Kiyotake grabbed the only goal of the game as Dortmund not for the first time this season struggled to convert their dominance into goals.
Hummels told the club s official website: This is currently a very, very hard phase in the Bundesliga. Everything goes wrong, what can go wrong.
Slowly it becomes really difficult to find explanations.
It is the most difficult phase for each individual. I believe that you can grow something. But nonetheless, it must be said that what we have planned for this season, is hardly implemented.
Hummels feels Dortmund could have claimed a positive result from every match in their six-game losing run.
There was not a single team that was stronger than us, but we have taken from six games only a point. This is sheer madness, he added.