Asked about his fitness, Cahill said he was ready to start if that is what coach Ange Postecoglou wants.
The Hondurans will have less time to acclimatise after arriving later on a commercial jet. Much of Australian media have dismissed Honduras's chances in Sydney after they were largely outplayed at home but Socceroos defender Josh Risdon struck a note of caution.
"I feel like I'm going to be involved and it's all about Wednesday night", Cahill said. "I have a great feeling about this game. that any chances we have, we're going to make the majority this time".
"Australia spied on Honduras's official training session from a drone, causing discomfort among the Honduran team and delegation", FENAFUTH said on its Twitter feed.
"It was a bit disappointing in that regard, but come this game on Wednesday, we'll be fully prepared and we'll take our chances this time". It was the same venue where the Socceroos ended decades of intercontinental playoff disappointments with a win on penalties over Uruguay in 2005 to qualify for the following year's World Cup in Germany.
And with the possibility of Australia not making the 2018 World Cup in Russia, Cahill knows in the back of his mind this may just be his last game for the Socceroos.
Australia will also have the luxury of more fresh legs with forward Mathew Leckie and midfielder Mark Milligan available after missing the first leg due to suspension. Sainsbury said nobody was under any illusions about what was at stake this week. "You win and we're going to Russia", Sainsbury said.
"You make a mistake and it could be the end of the road".
"This team is coming of age now and the next step will be to beat this Honduras team and then have a really good World Cup".