Peter Stoger was unhappy with his side’s display in the 1-1 draw over Atalanta, and believes they were lucky to progress.
Dortmund were close to crashing out of the Europa league, after a Toloi opener gave Atalanta an away goal.
However, Marcel Schmelzer came in as a substitute and scored the equaliser with seven minutes to spare. Dortmund won 4-3 on aggregate and Stoger believes luck was on their side.
Speaking afterwards, Stoger told reporters: “Well, effectively, we were a bit lucky. It was only to be expected that it would be difficult, but we certainly made it easier for them in the first half.
“We were not aggressive or physical enough, and we did not apply what we had spoken about doing beforehand. That was not the kind of professional game that you have to play on such occasions.
“We were better in the second half, and the substitutions worked well above anything else. I am really pleased for Schmelzer that he got the goal at the end, as he is our captain and had been out injured.
“Marco Reus showed what good he does for our game when coming off the bench. We had talked to him in recent weeks and wanted to be careful to avoid a relapse.
“We have the right attitude, and the boys have demonstrated that a number of times. Of course, I’m pleased that we are through to the next round, but we have also got a lot to talk about after this match.”