2. The maths

No team in Group B has yet qualified for the semi-finals. Chile and Germany have four points each, while Australia and Cameroon are both on one point.

To ensure progression, the Socceroos must beat Chile by two goals or more. Three points will take them level with La Roja, while the two goal advantage is necessary for Australia to leapfrog Chile on goal difference.

Can the Socceroos blunt the attack of Chile hitman Alexis Sanchez?

If Postecoglou’s side can only manage a one goal margin of victory, the Socceroos would be reliant on Cameroon beating Germany by a single goal and scoring less goals than Australia.

That would leave all four sides level on four points, with Australia holding the joint second-best goal difference in the group with Germany.

Goals scored would then be the deciding criterion – the Socceroos have scored three to the world champions’ four, such that a 2-1 victory over Chile and a 1-0 win to Cameroon would earn Australia a semi-final spot.

If both sides score an equal number of goals, head-to-head record acts as the tie-breaker. In those circumstances, Australia’s opening loss to Germany would send them home.

3. A century for Cahill

If Tim Cahill starts or is substituted on against Chile, it will mark his 100th appearance in Australian colours.

Much has been said about Cahill’s achievements, and he will be remembered as one of this country’s greatest ever footballers.

Can Timmy rise above the pack one more time?

Not that the former Everton star will let this milestone influence his performance. “When I am on the pitch it is all business,” Cahill said on Saturday.

The 37-year-old has had little impact at the Confederations Cup, coming on as a late substitute in each match.

Against Chile, though, Cahill’s aerial ability could be crucial.  The South Americans’ defensive unit is short in stature, and they conceded to Russia from a header in a pre-tournament friendly.

Can Cahill do it one last time for the Socceroos?