Olyroos coach Aurelio Vidmar is confident his players won't get complacent despite taking a "scary" 3-0 lead into Thursday night's Olympic qualifier second leg against Yemen.

Australia's under 23s need only to seal an aggregate win at Newcastle's Bluetongue Stadium to progress to the next phase of Asian qualifying for next year's London Olympics.

And Vidmar said his young players had shown enough maturity since arriving in camp to suggest they can finish off the job without hassle.

"2-0 or more is always a bit of a scary scoreline but I think these kids are mature enough," Vidmar said on Wednesday.

"... Most of these boys have been in these positions before, they've been in the under 17s or 20s and come up through tournaments, so they understand the dangers of this game.

"That's the coaching staff's job too, to make sure that they're motivated and don't take their foot off the pedal.

"Because we all know, if we concede one goal, then everything's up for grabs again."

Vidmar was delighted with how his young players had approached the two-legged tie, played solely in Australia because of the political unrest in Yemen.

"They've been the perfect son-in-laws you could say," Vidmar said.

"... It's not easy being in the camp for two weeks because at some stages living together it gets a little bit testy, but the mood has fantastic.

"It's never easy also for the guys who don't get to start and are sitting on the bench but they've been the main ones who have been sparky and positive."

Vidmar kept his selection cards close to his chest, saying he would wait until after Wednesday night's final training session before deciding with to stick with the same starting side from Sunday's first leg win in Gosford.

He hoped Australia could put their Middle Eastern opponents to the sword after several chances went begging in the first match.

The winner of the tie earns a spot in the next phase of qualifying, where 12 Asian teams are split into three groups of four.

The winners of each group qualify directly for the London Games while the second-placed teams get another chance through a playoff system.

AAP