The Socceroos are taking on China in the neutral Emirate of Sharjah overnight in a key FIFA World Cup qualification match.
Last time these two sides met, Australia ran out 3-0 victors, with the disappointing Chinese unable to even lay a glove on the high-tempo Socceroos in Qatar.
Here's everything you need to know.
What happens if the Socceroos win?
A win will put the Socceroos back on track after dropping points in successive World Cup qualifiers.
A 2-1 defeat in Japan ended the Socceroos' world record 11-game winning run in World Cup qualification matches, which was followed up by a 0-0 draw against Saudi Arabia in Parramatta on Thursday.
That leaves the Socceroos three points behind Saudi Arabia and just one point ahead of Japan in the race for one of two automatic qualification spots.
The team that finishes third will play off against the third-place finisher in the other Asian qualification group, then face an intercontinental play off to reach the World Cup finals in Qatar.
What happens if the Socceroos lose?
Potentially, the Socceroos would drop out of the top two in the group, which would clearly be less than ideal with four tough games left to play.
Unbeaten group leaders Saudi Arabia take on winless Vietnam at 11pm AEDT in Hanoi, which the Saudi's would expect to win, although they might find the going harder than they'd like against a team that are tough to beat on home soil.
Japan, meanwhile, travel to surprise packets Oman, who stunned them 1-0 on match day one, thanks to an 88th minute Issam Al Sabhi goal in Osaka.
Another surprise result would be hugely beneficial for Australia, especially with Oman needing a win to keep pace with Japan after their surprise 1-1 draw against China in Sharjah on Friday.
However, a win for Japan would heap the pressure back on the Socceroos — regardless of the result against China.
Who replaces Harry Souttar?
Arnold has given Red Star Belgrade defender Miloš Degenek his backing to replace the sizeable Harry Souttar-shaped hole in the heart of the Socceroos defence for this tie.
Souttar tore his ACL late in Thursday's clash with Saudi Arabia and will be out of action for an extended period.
Degenek, 27, missed the Socceroos matches against Oman and Japan last month after testing positive for COVID-19, but Arnold says he is confident he will be able to step into the starting lineup with no issues.
"Miloš has come back in very good condition," Arnold said.
"He's at a very successful club in a very good competition.
The Socceroos could be forced into a whole new centre back pairing for the China match, with Trent Sainsbury battling a hamstring injury.
Sunderland defender Bailey Wright and Kuwait SC's Ryan McGowan have been added to the squad as cover.
When are the Socceroos playing?
The match kicks off at 2am AEDT at Sharjah Stadium in the United Arab Emirates.
That's 1am in Queensland, 1:30am in South Australia, 12:30am in the Northern Territory and 11pm on Tuesday night in Western Australia.
How do I watch the Socceroos match?
The match will be broadcast on Channel 10 across the country.
The match will also be available on 10 Play.
When do the Socceroos play next?
The Socceroos will all go back to their clubs after this international break, and will reconvene in the new year for matches against Vietnam (at home) and Oman (away) at the end of January – beginning of February.
Then, in March, the big matches of the campaign against Japan at home and Saudi Arabia away will take place.
