Australia will play their final match on Tuesday against Lebanon in Sydney before Arnold selects his 23-man squad for their Asian Cup title defence in the UAE.

The Socceroos open their Asian Cup campaign on January 6 against 92nd ranked Jordan.

Captain Mark Milligan, goalkeeper Mat Ryan, attacking regular Mathew Leckie and midfield pair Tom Rogic and Aaron Mooy are locks for the Asian Cup squad if fit.

Trent Sainsbury, Aziz Behich, Josh Risdon, Massimo Luongo, Jackson Irvine, Robbie Kruse and Tomi Juric would be shock omissions if not included too.

Arnold has held three camps since taking over as Australia coach following the 2018 World Cup but remains undecided on his final selection for UAE.

"There's still half a dozen positions up for grabs," Arnold said. "I had an extended squad (31 players) in September and here to give me more players to look at.

"Performances are key. Players that are performing well.

"Tomorrow night is an opportunity for those players to show me and the country that they're hungry and want selection for the Asian Cup."

The ex-Sydney boss didn't give much away about his likely starting XI against Lebanon, although he hinted Awer Mabil - who was the player selected for the pre-game press conference - would start.

He also reiterated Tim Cahill would play five minutes at the end of the match as a substitute only.

"The first 85 minutes is all about our performance and what we practice at training," he said. "There are no friendly games. The last two minutes can be about Timmy but otherwise it's all about us.

"It's about giving the players the opportunity to show me their qualities to be selected in the Asian Cup squad."

Arnold has included A-League pair Craig Goodwin and Rhyan Grant for the Lebanon clash, having previously been listed as train-on players and outlined their qualities.

"Craig gives us something totally different tactically," Arnold said. "That's a left winger that can play high and wide.

"Rhyan Grant gives us another option to look at at right-back, in a similar mould to Josh Risdon."