Jurgen Klopp has claimed that nerves played a leading role in Borussia Dortmund's late collapse in the 2-1 defeat away to Bayern Munich on Saturday.
Dortmund looked on course to end a four-game Bundesliga losing streak at the Allianz Arena after Marco Reus fired the visitors into a first-half lead over the champions.
However, Robert Lewandowski bagged a 72nd-minute equaliser against his former club, while Arjen Robben converted a penalty four minutes from time to complete the comeback.
"It was close. It was a good first half and a less good second, in which we buckled to the pressure," manager Klopp told reporters.
"We deserved something for the first half but not for the second. We've invested a lot but got nothing in return, and that's what we have to worry about.
"But many congratulations to Bayern on a deserved win."
Klopp's side stay 16th in the German top flight, having not won in seven outings.
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