Langerak, 22, was handed his debut by Klopp after regular number one Roman Weidenfeller injured his knee in training during the week.

And the former Melbourne Victory stopper handled the occasion well, helping BVB move 13 points clear in the Bundesliga and end 19 years without a win at Bayern.

Klopp told "Mitch Langerak protected the lead for us and, all things told, he controlled everything terrifically.

"We are hugely satisfied. The boys have put in an incredible amount of work today but without that it wouldn't have panned out as it did."

Dortmund went ahead early through Lucas Barrios, before Bayern levelled from a corner when Luiz Gustavo emphatically finished giving Langerak no chance.

Langerak's side re-claimed the lead on 18 minutes, though, when Nuri Sahin fired in from outside the box.

The Australian keeper looked composed in the first-half as Bayern probed for a leveller, with Langerak showing good judgement on a number of occasions when coming off his line.

Mats Hummels added Dortmund's third on the hour mark, before Langerak made a superb low save on 75 minutes to deny Mario Gomez from close range.

Elsewhere in Germany on Saturday, Socceroo Nikita Rukavytsya scored one goal and provided the assist for another in Hertha BSC's 5-0 win at Alemmania Aachen in 2.Bundesliga.