Graham Arnold's men sit second in Group D heading into the matchday three, and a draw in their next outing could see them progress to the knockout phase.
Kasper Hjulmand's men, meanwhile, are third in the group with one point from two games, but a victory in their final group-stage outing would put them on course to qualify, albeit depending on the result between Tunisia and France in the other fixture.
Here, Sports Mole looks at how the squads of Australia and Denmark stack up against each other ahead of Wednesday's contest.
AUSTRALIA
Most valuable player:
Mathew Ryan (£4.3m)
Overall squad value:
£32.3m
Most capped player:
Mathew Ryan (77)
Leading goalscorer:
Mathew Leckie (13)
Total caps:
569
Total goals:
71
Oldest player:
Danny Vukovic (37)
Youngest player:
Garang Kuol (18)
Average age:
27.1
SQUAD IN FULL
Goalkeepers: Mathew Ryan (Copenhagen), Danny Vukovic (Central Coast Mariners), Andrew Redmayne (Sydney FC)
Defenders: Aziz Behich (Dundee United), Milos Degenek (Columbus Crew), Bailey Wright (Sunderland), Fran Karacic (Brescia), Harry Souttar (Stoke City), Nathaniel Atkinson (Hearts), Joel King (Odense), Kyle Rowles (Hearts), Thomas Deng (Albirex Niigata)
Midfielders: Aaron Mooy (Celtic), Jackson Irvine (St Pauli), Ajdin Hrustic (Hellas Verona), Riley McGree (Middlesbrough), Keanu Baccus (St Mirren), Cameron Devlin (Hearts)
Forwards: Mathew Leckie (Melbourne City), Awer Mabil (Cadiz), Jamie Maclaren (Melbourne City), Mitchell Duke (Fagiano Okayama), Martin Boyle (Hibernian), Craig Goodwin (Adelaide United), Jason Cummings (Central Coast Mariners), Garang Kuol (Central Coast Mariners)
DENMARK
Most valuable player:
Pierre-Emile Hojbjerg (£39m)
Overall squad value:
£305.9m
Most capped player:
Simon Kjaer (122)
Leading goalscorer:
Christian Eriksen (39)
Total caps:
1,034
Total goals:
139
Oldest player:
Kasper Schmeichel (36)
Youngest player:
Mikkel Damsgaard (22)
Average age:
27.2
SQUAD IN FULL
Goalkeepers: Kasper Schmeichel (Nice), Oliver Christensen (Hertha Berlin), Frederik Ronnow (Union Berlin)
Defenders: Simon Kjaer (Milan), Joachim Andersen (Crystal Palace), Daniel Wass (Brondby), Joakim Maehle (Atalanta), Andreas Christensen (Barcelona), Rasmus Kristensen (Leeds United), Jens Stryger Larsen (Trabzonspor), Victor Nelsson (Galatasaray), Alexander Bah (Benfica)
Midfielders: Mathias Jensen (Brentford), Christian Eriksen (Manchester United), Pierre-Emile Hojbjerg (Tottenham), Christian Norgaard (Brentford), Mikkel Damsgaard (Brentford)
Forwards: Yussuf Poulsen (RB Leipzig), Andreas Skov Olsen (Club Brugge), Jesper Lindstrom (Eintracht Frankfurt), Andreas Cornelius (Copenhagen), Martin Braithwaite (Espanyol), Jonas Wind (Wolfsburg), Kasper Dolberg (Sevilla), Robert Skov (Hoffenheim)
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