The pair missed the French series after Sio suffered a hamstring injury and White a knee injury before it kicked off in July.

Both were named on the bench for Australia's second Test against New Zealand in Auckland on Saturday. Rennie, 57, confirmed White was ready to go.

"He's worked really hard," he said.

"He's got a lot of volume of training in and a lot of acceleration/deceleration stuff for a (scrumhalf) is important. I mean he's done a good volume of kicking, so he's ready to go."

Tate McDermott, who has six Tests under his belt in the No.9 jersey, will start at scrumhalf with White ready to sub in.

Rennie was not prepared to stipulate how many minutes White would get coming off the bench in his first international Test back after returning to training last week.

"Look in the end, Tate's last couple of games he has played high-60s (in minutes)," he said.

"We're watching players. If Tate starts things slow to the breakdown or we feel we need Nic's skillset, then we'll make a change.

"But on the day of the game we'll go through and we'll guesstimate who we think will play for X amount of minutes. So we go in with a bit of a plan but of course you get injuries and form sometimes dictates changes."

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The side was without the experienced ACT Brumbies pair in their 33-25 loss in the Bledisloe opener last weekend.

The Wallabies are hunting an historic win on Saturday at Eden Park for the second Bledisloe Test, having last won at the venue in 1986, to keep their hopes of ending a 19-year series drought alive.

White said they saw last weekend what could happen if they backed off for 15 minutes and so they needed to ensure they were focused for a full 80 minutes.

He also praised the medical staff in Canberra and the Wallabies camp for helping get him back so swiftly after his medial collateral ligament injury.

"I think there's a number of things that we've kind of got our eyes on changing and we don't want to give too much away there and give the All Blacks too much motivation, [but] for us I think it's having belief in that when we do things well, that we can put them under pressure," he said.

"To beat them, we're going to have to be on our game for glimpses there, you saw that at the start and the finish, and we just need to marry that all together."

Another level of experience to help get them across the line will be Sio, who has 68 Australian Tests next to his name.

The prop was left out of the Wallabies' camp in April, before he was welcomed back into the green and gold fold in June for the French series. Despite earning back his spot, he suffered another blow - a hamstring injury.

Rennie said, like White, the 29-year-old prop was ready to go against the All Blacks after recovering.

"He's been excellent. He missed out on our squad in April. That was a bit of kick in the backside for him and to his credit he's worked hard. He came into camp and he was training outstandingly well," he said.

"He's dynamic, a very good scrummager. He deserves an opportunity."

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