Leckie netted a double in the friendly victory in St Polten, after Australia left Turkey after an intense 10-day training camp.

"It's confidence because we believe what we're doing is working and what we're working on is going to give us a chance," Leckie told Fox Sports.

"When you lose you've got to work extra hard. It feels good knowing what we've been working on, we can pull it off.

"Great result, we move on."

Australia are next due to face Hungary ahead of their World Cup opener against France on Saturday 16 June 8pm AEST.

"We'll continue on exactly what we've been working on and hopefuly make it better," he said.

"It was never going to be perfect. We've still got a couple more weeks to make it better."