Essentially, the equation is this: win and hope.
The Socceroos' 1-1 draw with Denmark and France's 1-0 defeat of Peru ensures Les Bleus will be in the knockout stage and confirms Peru cannot continue on in Russia.
It leaves Denmark and Australia in a shootout to accompany France in the round of 16, with the Socceroos' World Cup hopes hanging by a thread.
Here is what Bert van Marwijk's side require to continue on in Russia past Tuesday's (Wednesday morning AEST) showdown in Sochi.
STEP A: AUSTRALIA DEFEAT PERU
A win over the South Americans would give Bert van Marwijk's team four points, drawing them level with Denmark.
STEP B: FRANCE DEFEAT DENMARK
Should the French clean sweep the group, they'll finish with nine points, and restrict Denmark to four points.
STEP C: TALLY THE GOALS
If the above results occur, Australia will qualify on goal difference with a win of more than one goal.
If Australia win by one, it will come down to how many goals Denmark lose to France by.