Hertha Berlin midfielder Alexander Baumjohann has suffered a major setback by tearing his cruciate knee ligaments again.
Bayer Leverkusen claimed a shock 2-0 Bundesliga win at Borussia Dortmund on Saturday, while Hannover beat Schalke.
Hertha Berlin surrendered a two-goal lead to draw 2-2 with Werder Bremen at the Olympiastadion.
Stuttgart followed Mainz out of the DFB-Pokal in the first round, succumbing 2-0 to Bochum, while Marco Reus returned in a victory for Borussia Dortmund.
Hertha Berlin insist they are not interested in signing Fulham striker Konstantinos Mitroglou.
Hamburg have completed the signing of Pierre-Michel Lasogga from Bundesliga rivals Hertha Berlin.
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