Supporters shouldn't be disheartened by the dour draw with Bafana Bafana as the best is very much still to come, according to the star forward
Australia will depart for Brazil on Wednesday with memories of a lacklustre 1-1 draw against South Africa fresh in their minds.
Ange Postecoglou attributed the sluggish showing to the effects of a heavy training load over the last two weeks, with Cahill echoing his coach's interpretation of the game at ANZ Stadium.
"That was never ever going to be the finished product but I know for a fact that the amount of effort we've put in this last 10 days, on and off the park, tactically, knowing our jobs. It was good to see part of that," he said.
The Socceroos were without three first-choice players due to fitness concerns and Cahill tipped their return - along with more hard yards on the training field - to make the difference when it counts.
"You've got so much depth here with Matthew Spiranovic, Mile Jedinak, (Mark) Bresciano, Josh Kennedy," he said.
"Who knows what the end line-up's going to be, but overall everyone's got to play and make sure they contribute to the team.
"We've got things that we've been doing in training and tactically, what we believe in. It's all about training. We've got three weeks to work on the team. It's all about peaking at the right time. We'll work hard now."
There were 50,000 supporters cheering the Socceroos on against Bafana Bafana on Monday night and although there were more than a few empty seats in Sydney, Cahill dismissed suggestions Australians are less excited about this tournament compared to the Germany and South Africa campaigns.
"I'm buzzing," he said.
"I still feel the same as 2006. We've had a lot of success. This is our third successive World Cup campaign, so there the fans are used to it. So are the media. You probably need to blow it up a bit more for us."