Tigana insists Fulham can still go through to the fourth round of the competition despite Facundo Sava's own goal giving the Germans a slender advantage.
"For Sava it was unlucky but it was a big mistake," said the Fulham boss.
"It's not bad to score away in a game like this and I would be happy to win the next game 1-0.
"That will be our target. I believe we can go through."