Australia have called up flanker George Smith, full-back Jesse Mogg and centre Ben Tapuai ahead of the second Test against the Lions.
The Wallabies have an alarming number of injury concerns heading into Saturday's series-decider.
Pat McCabe (neck), Berrick Barnes (jaw) and Digby Ioane and Adam Ashley-Cooper (shoulder) are all serious doubts for the second Test in Melbourne.
Christian Lealiifano is another who needs to be assessed, after being forced to leave the field less than a minute into making his international debut against the Lions in Brisbane.
Of the new trio that have joined the Australian squad only Mogg is uncapped, with Tapuai having won seven caps for the Wallabies in midfield.
Smith, who made an impressive return to Super Rugby playing for the Brumbies this season as injury cover for David Pocock, won 110 caps for Australia between 2000-2009 and played against the Lions in the 2001 series.