BVB overcame Malaga 3-2 at Signal-Iduna Park thanks to two stoppage-time goals in the second leg of their quarter-final tie on Tuesday evening.
"Up until now, our story has been like a Hollywood movie," the defender told reporters.
"Hopefully it will have a Hollywood ending. I can't really believe it. This is the craziest moment of my career. It was been a special match for us and the fans."
The win means that Dortmund have reached the semi-finals of Europe's premier club competition for the first time since they won the trophy back in 1997.