Borussia Dortmund manager Jurgen Klopp has claimed his side were "not clever enough" in Sunday's 1-1 draw with Hannover that now leaves the German champions trailing nine points behind league leaders Bayern Munich.
Despite taking the lead through Robert Lewandowski, an 87th-minute Mame Diouf equaliser means Dortmund have picked up just three wins from seven league games, while Bayern have a 100% record.
Klopp was more frustrated than anybody at his team's inability to close out a game in which they were leading with just minutes remaining.
"We were not clever enough," he said. "We had too many set pieces against us and eventually the ball went in. It is difficult to run down the clock in Hannover, but we weren't too good tactically either."
Bayern have now made the best ever start by any team to a Bundesliga season following their 2-0 victory over Hoffenheim on Saturday. They have won all seven of their league games, while scoring 21 goals and conceding just two in the process.
Klopp, however, says he is not concerned about his title rival's results, preferring to focus on his own team.
"I am not interested in Bayern's advantage," he said. "We want to play our own season, independent from other teams. Gaps after seven matches are not important."
It was a frustrating day all round for the Dortmund boss as he was forced to make three substitutions due to injuries to Jakub Blaszczykowski, Sven Bender and Mat Hummels.
Blaszcyzkowski faces up to six weeks out with a syndesmosis injury and Bender is expected to be fit soon after picking up a facial injury, while Hummels, who bruised his foot, could be fit to play in Germany's World Cup qualifier in Ireland on Friday.
Up next for Dortmund are rivals Schalke in the Ruhrderby after the international break.