By FOX Sports staff
BVB took the lead at the Esprit Arena in the 20th minute through a Nuri Sahin strike and looked to have secured the win ten minutes after the hour mark when Jakub Blaszczykowski scored, but were made to endure a nervy ending when Adam Bodzek pulled one back for the hosts two minutes from time.
Klopp was still pleased with his side's overall display but admits they were slightly lucky as things could have been very different after their opponents made it 2-1 late on.
"I am very satisfied with the win," he said. "From the 10th minute we played a good game with Nuri scoring a world-class goal.
"Though, in the second [half] we allowed the opponent too much [space] and they came out and did well.
"But from my point of view it was not serious as it is normal that we can lose a little bit of concentration. We are certainly not undeserved winners, just that due to their late goal, it was a little lucky."
Klopp also dismissed the significance of him making ten changes to his starting XI from Wednesday's incredible 4-1 win over Real Madrid in the UEFA Champions League semi-final first leg, as both Robert Lewandowski and Marco Reus had to settle for a place on the bench.
"We must not exaggerate," he added. "We talked about the record of Lewandowski [scoring in 12 consecutive matches] before - I told him he can feel safe about his record because in the next 100 years no one will beat it.
"[Mario] Gotze had some muscular problems. [Ilkay] Gundogan had problems with his neck, while [Lukasz] Piszczek with his adductors. All three of them were not able to play today [Saturday]."
Dortmund will be looking to book their place in the Champions League final for the first time since the 1996/97 season when they visit the Santiago Bernabeu to take on Real in the second leg of their last-four clash.