The draw for next summer's tournament in Russia was made on Sunday morning and the Socceroos have been placed in Group B alongside Die Mannschaft, Chile and the eventual champions of next year's Africa Cup of Nations.
Since winning the 2014 World Cup, the Germans have gone through somewhat of a period of transition, with stalwarts Philipp Lahm, Per Mertesacker and Miroslav Klose all retiring.
Postecoglou is still expecting a massive test though, and is hopeful his side will be able to rise to the challenge of playing one of the best teams in the world at a major tournament.
He said: "Always a major player in major tournaments and I’ve no doubt this will be the same. They are sort of regenerating their team a little but they’ve started World Cup qualification strongly.
"We played them recently in a friendly but to play them in a major tournament is an exciting prospect. And our continued growth as a nation will only come when we play against the very best."