Jurgen Klopp claimed full responsibility as his Borussia Dortmund side fell to a shock 1-0 defeat at home to Hamburg.
Dortmund are now winless in their last four league games and just two points above the relegation zone following Pierre-Michel Lasogga’s first-half winner.
Dortmund were a shadow of themselves after their impressive 3-0 Champions League win at Anderlecht in midweek as Hamburg picked up their first victory of the season.
“For all our ambitions and goals, this is currently not nearly enough,” said Dortmund coach Klopp. “I take full responsibility for the preparations and the tactics.
“We’re left with seven points and we’re not even looking at the top of the table.”
Hamburg scored as a poor pass from Dortmund striker Adrian Ramos was snapped up by Marcell Jansen who fed Nicolai Muller and the right-winger sprinted away, drawing goalkeeper Roman Weidenfeller for Lasogga to slot into an empty net on 35 minutes.
Ten-man Schalke also suffered an afternoon to forget as they went down 2-1 at Hoffenheim, who moved up to second in the table.
The Royal Blues found themselves behind after only 13 minutes as Norway’s Tarik Elyounoussi put the hosts into the lead.
Adam Szalai then slotted home their second against his former club on 29 minutes.
Schalke finished with 10 men after Cameroon’s Joel Matip was shown a second yellow and subsequent red before Klaas-Jan Huntelaar scored a late consolation goal.
Bayer Leverkusen dropped to fourth after drawing 2-2 at home to 10-man Paderborn.
Paderborn took an early lead through midfielder Suleyman Koc before Leverkusen captain Lars Bender equalised.
Paderborn had 10 men for the last 20 minutes after Marvin Bakalorz was shown a straight red for tackling Brazilian defender Wendell from behind.
Moritz Stoppelkamp gave Paderborn a late lead before Karim Bellarabi celebrated his first Germany call-up with Leverkusen’s equaliser on 90 minutes.
Elsewhere, Frankfurt moved up to fifth with a 3-2 comeback win at home to Koln as captain Alexander Meier scored twice before an own goal by goalkeeper Timo Horn sealed the win.
Werder Bremen slumped to the bottom of the Bundesliga as Freiburg secured a 1-1 draw.
