Langerak has been credited with winning the game for his side after an noteworthy save to deny Stefan Kiessling from close range.
The keeper instead placed the emphasis on the players in front of him.
"I always train hard and stay focused on my duties", Bundesliga.com quotes Langerak as saying.
"You always have to be ready to play, just like my last appearance in the final against Bayern Munich. I'm happy if I can help the team, but I was just doing my job.
"It's my job to make some difficult saves and help the team, but the 10 lads in front make it easy for me."
Dortmund moved above Leverkusen after Saturday's win.