Lopetegui says the result was a fair one.
He later said: "It's the Champions League and the level of the opponent is there. They got ahead of us in the first one they had.
"I think we deserved to turn the scoreboard. We played against a very good team, the second in the Bundesliga last year. We are the only ones who achieved a point away on this day.
"In the first half we were good, we controlled a complex team. We had a clear chance and in the second they came and scored. Then it got complicated, because they defend well.
"Until then there was a game plan but we rebuilt ourselves and we could've won the game at some point in the end."