Centre Hunter Paisami and lock Lukhan Salakaia-Loto have both left camp to return to Brisbane for the birth of their first children.

Wallabies coach Dave Rennie said both Paisami and Salakaia-Loto "probably" would have faced the All Blacks if the match went ahead as planned on Saturday, instead of September 5 at Perth Stadium.

"Their partners are due on the first [of September] and beyond so they both came here originally and have since left," Rennie said.

There may be more changes to come soon after, with James Slipper's ability on both sides of the scrum looming as a crucial weapon in Rennie's arsenal as the Wallabies prepare for life without Allan Alaalatoa.

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Wallabies coach Rennie says the ACT Brumbies captain and tighthead prop is set to miss a chunk of The Rugby Championship "on baby duty".

But just when that is remains something of a mystery with Alaalatoa seen as a certainty for the third Bledisloe Cup Test.

The Wallabies will shift to Queensland for the remainder of The Rugby Championship, with 27-year-old Alaalatoa a chance to feature against South Africa on the Gold Coast on September 12.

But then he is likely to leave camp to be with his family, which would mean Rennie needs to call on another tighthead prop to split the load with Taniela Tupou.

Slipper and Tom Robertson can both fill roles at tighthead and loosehead prop, while Scott Sio came off the bench at loosehead in the second Test at Eden Park.

"When we look even further ahead, Allan Alaalatoa will eventually leave us on baby duty as well, so we're not certain when that is," Rennie said.

"He will certainly be available for this Test and hopefully for the first South Africa one. [Robertson's] ability to play both sides and James Slipper's ability to play both sides can help us with selection for him long-term."

Rennie says Alaalatoa is on baby duty "as well" because he is not alone as the fallout continues from the All Blacks' original no-show in Perth, with two key Wallabies ruled out of the rescheduled clash.

Paisami's unavailability opens the door for Samu Kerevi to make his first Wallabies appearance since 2019.

Rennie was non-committal on Kerevi's potential selection but said he had transitioned well at training back into the 15-man code following a short stint with Australia's Olympic sevens team.

"He's been excellent. He's an experienced man who's contributing really well. There's a fair bit to get your head around but he's been excellent," Rennie said.

The All Blacks will also be without three influential players because of pending baby commitments - skipper Sam Whitelock and first-choice halves Richie Mo'unga and Aaron Smith.

Rennie stopped short of saying there'd be an extra edge when the two sides finally faced off again because of the All Blacks' late arrival in WA, but said he was still disappointed by their actions.

"We're not necessarily using it as extra motivation," Rennie said.

"The All Blacks committed to play us originally on the 21st and then the 28th and, had they come over here, what we knew was on the 29th we're all jumping on a plane heading to somewhere in the world.

"Whether that was Brisbane, South Africa or that was the UK and, from that perspective, we felt they should have been on the plane and come over and fulfilled their commitments.

"But anyway ... they're here now. There's plenty of motivating factors and the biggest one is the scoreline last time we played."

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