The Wallabies have lost their first two matches of the Rugby Championship to the All Blacks, 22-0 and 27-19.
And although Genia described their efforts so far as "not good enough", he said the players had reacted to their poor start by lifting standards in training.
"We've just got to be harder on ourselves as a group and demand more of each other, particularly in game, so we can get those things right," Genia said.
"Making the same errors over and over again is not good enough, particularly in the last couple of weeks we've played.
"We've addressed that in team meetings, but more so in the way we've gone about our work in training and preparing for the game."
The Wallabies will be without hooker Stephen Moore, who injured his hamstring in Thursday's training run, and first-choice openside flanker David Pocock.
Tatafu Polota-Nau will replace Moore, while Michael Hooper takes the number seven jersey.
"You've got blokes coming in who can definitely do as good a job as those who are missing," Genia said.
"You get work rate from those guys and you get impact.
"We've got 22 fit blokes who will do the job and that's all you can ask for."
Pressure has mounted on coach Robbie Deans with speculation a loss tomorrow might end his stint as Australia coach.
The Wallabies have beaten the Springboks in their past four encounters, but the South Africans have enjoyed success in Perth where they receive significant crowd support.
Deans said Australia's favouritism would count for nothing.
"We're not aware of that, we're not conscious of that, we're just concentrating on what we need to," he said.
"The past is genuinely totally irrelevant. It's an important game for both teams. They'll desperately want a result, so do we.
"It's a Test match, it's never easy."
Deans also bristled at suggestions the team would have a point to prove after successive losses.
"Every Test match you have a point to prove. They stand alone in terms of the calendar," he said.
"This date will never come round again, this Test match will never come round again.
"The whistle goes, it's 80 minutes full on and then it's done."
Springbok captain Jean de Villiers insists his team are expecting a tough game despite Australia's struggles.
"They were up against a quality side in New Zealand, the number one ranked team in the world, the World Cup winners, all of that," he said.
"(Australia) are a very skilled team. I think, as a backline player playing against them is difficult.
"They've got a lot skill running wise in attack and in defence. They're always solid."
South Africa beat competition newcomers Argentina 27-6 in Cape Town in their opening match, but could only manage a 16-16 draw in their last start against the Pumas.
Duane Vermeulen will debut for the Springboks as part of an inexperienced group of forwards.
Rather than view their limited match-time as a negative, De Villiers believes it gives the players the chance to strengthen their claims for a permanent spot in the side.
He added: "I read something yesterday where our pack, the starting eight, only has 112 caps. Last year John Smit had 111 and Victor Matfield had 110.
"It makes a big difference inexperience within the squad, but I think the guys that have come in have done really well and they've taken their opportunities.
"Once you've got a new team and once you're building as a team it's an opportunity to put up your hand and stake your claim for a position in the team and stay there for a long time.
"I think the guys have done that and hopefully we can show some more maturity tomorrow."
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