Joe Schmidt is in no rush to come to a decision on whether to sign another deal with Ireland or seek pastures new next year.
Australia can go third in the rankings if they beat Ireland in the last match at Allianz Stadium before it is knocked down next year.
Joe Schmidt has made five alterations to his starting line-up, while Lukhan Tui and Nick Phipps come into the Australia side in Sydney.
Ireland have not ruled out international recalls for Paddy Jackson and Stuart Olding.
Despite suffering a nasty cheekbone injury in Melbourne, Adam Coleman expects to play in Australia's series decider with Ireland.
With Will Genia undergoing surgery on a broken arm, Australia have added Waratahs scrum-half Jake Gordon to their squad.
Michael Cheika was critical of the Cian Healy challenge that broke Will Genia's arm.
After guiding Ireland to their first away win over Australia for almost 40 years, Joe Schmidt was reluctant to celebrate.
Australia and Ireland are tied at one win apiece heading into the deciding Test in Sydney next weekend.
Michael Cheika was not impressed with Neil Francis' choice of words when criticising David Pocock and neither was Peter O'Mahony.
Ireland need to win the second Test to keep their hopes of winning the series in Australia alive, and Johnny Sexton is back in their XV.
Michael Cheika named an unchanged Australia squad for his team's second Test against Ireland.
Australia did not always have it their own way against a much-changed Ireland team, but, according to Michael Hooper, that was their plan.
Ireland were beaten for the first time in over a year against Australia, but Joe Schmidt saw an experimental side as competitive.
Ireland tasted defeat for the first time since March 2017, as David Pocock returned to give Australia victory in the first Test.
Ireland will expect to extend their winning run by another three matches in Australia, according to Wallabies coach Michael Cheika.