By ESPNSTAR.com staff
The defeat was the Bavarians' fifth straight loss to Dortmund in two years - and it also represented a disappointing domestic campaign for Bayern as they lost out both league and cup titles to Dortmund.
However, Bayern have a chance to salvage their season with a Champions League final at the Allianz Arena next week against Chelsea looming, and Kahn believes that they must put the loss behind them.
"The question is whether the players can put that behind them quickly enough," he said.
"They have got to press the delete button and focus fully on what they can now achieve. Winning the Champions League is the only priority.
"The time to analyse and talk about the DFB-Pokal final comes after the season, that has got to be put back."
Kahn was part of the Bayern team that last won the Champions League title in 2001, a victory which came two years after their infamous last-gasp defeat to Manchester United.
The 42-year-old said that cruel defeat galvanised the side and he has warned that Chelsea are now in a similar situation.
"They also lost a Champions League final in tragic circumstances," he said. "That will still hurt, just like with us in 1999.
"There is the risk that you could see Chelsea as being a pretty average side, but nobody will be stupid enough to take them lightly."
Kahn has stopped short of declaring Bayern as favourites, not least given their performance in Berlin on Saturday.
"They are a surprise package," he told the Bild newspaper. "That is very untypical of Bayern.
"They go and win in Madrid, and then there is such a thing like against Dortmund in between - they have no consistency.
"I don't want to make any predictions."