Langerak will make his debut for Bundesliga leaders Dortmund on Saturday against third-placed Bayern at Allianz Arena, after regular number one Roman Weidenfeller was injured in training on Tuesday.

On Friday, Dortmund ruled Weidenfeller out of the Bayern game after scans earlier in the week revealed a ligament and small capsular tear in his left knee.

Weidenfeller has conceded just 13 goals in 23 league games this season but Klopp insists he's confident Langerak can do the job against the likes of Franck Ribery, Arjen Robben and Mario Gomez.

And the 22-year-old former Melbourne Victory shot-stopper appears calm about the prospect too.

"It doesn't matter if it is my debut in Munich, I will just do my best," Langerak told Die Welt.

"I have been working for such an opportunity for weeks, months even.

"Of course it will be a great challenge for me. But last summer when I arrived in Germany I played a few games."

Langerak was involved in a number of pre-season matches for BVB after his May arrival at the club, while he also played 90 minutes last week for the club's reserves side in a 1-0 win over Moenchengladbach II.

Dortmund midfielder Sven Bender was also confident Langerak would perform well.

"He's an outstanding goalkeeper who deserves this opportunity," Bender told Die Welt.