The Wallabies have dropped to an all-time low world rugby ranking of seventh after Saturday's loss to Argentina.
The 23-19 defeat relegated Michael Cheika's side to the foot of the Rugby Championship ladder, with away tests in Argentina and South Africa to come.
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Only 10 months ago, before their 2017 northern tour, Australia were third, but since losing to England at Twickenham, the Wallabies have won just three of their last 10 tests.
After their final two Rugby Championship fixtures, Cheika's side take on the All Blacks in Tokyo for a dead-rubber Bledisloe Cup clash, before heading north again for tests against Wales, Italy and Eddie Jones' England.
Despite Saturday night's two-point loss to the Springboks, Steve Hansen's All Blacks side remain atop the rankings, with Ireland and Wales rounding out the top three.
South Africa have jumped from seventh to fifth.
World Rugby Rankings
1 - New Zealand - 92.52
2 - Ireland - 90.12
3 - Wales - 85.94
4 - England - 85.68
5 - South Africa - 83.35
6 - Scotland - 83.02
7 - Australia - 82.45
8 - France - 79.10
9 - Argentina - 79.02
10 - Fiji - 76.54