Borussia Dortmund dropped a 1-0 decision to Hannover on Saturday, losing their fifth in six Bundesliga matches.
Jürgen Klopp said there is nothing Dortmund can do except continuing to fight.
"We will continue to fight. There is no alternative.
"We had four or five great chances, but nothing made of it. We need to reward ourselves [with goals], but we're not doing that."
Dortmund has struggled in the Bundesliga while playing well in the Champions League.