The BVB coach was quite disappointed with his side's lack of accuracy during the 0-0 draw with Malaga, but was satisfied with the result
The Bundesliga champions got a number of good chances to break the deadlock, but failed to find the net and had to settle for a scoreless draw at the Rosaleda.
"We didn't take our chances and had to stay calm in order to get a result in the end. We somehow lost a bit of determination towards the finish and Malaga started playing better," Klopp said at a press conference.
"I told my team at half-time that they were playing great, but needed to improve in the finishing department. The players still have room for improvement in that regard.
"A lot of the things that we did, we did well but we lacked that final touch. That's the next step.
"But we gave a good performance against a good team. We had the better chances and a 0-0 draw is a result we can live with.
"Malaga played as we expected them to, yet I think we managed to leave an impression with our performance. We played well against tough opposition.
"However, even if we had scored a goal, I doubt it would have upset Malaga a great deal. We know what we have to do in the return leg. We want to win the return leg.
"We managed to avoid injuries and suspensions here and now we look forward to next week."
Dortmund will be looking to book their ticket for the semi-finals at the Westfalenstadion on April 9.