When it comes to competing with the best rugby scrum in the world, size does matter.

Whether it matters enough to win 130kg-Wallaby prop Rodney Blake a start against the All Blacks in Saturday night's return Tri-Nations Test at Suncorp Stadium is the question confronting Australian coach John Connolly.

Connolly has to weigh up if forward giant Blake, who has missed all three tests with an ankle injury, is fit enough to tackle the ruthless Kiwis on the strength of just one game for Australia A against Fiji last Friday night.

It could be a case of "Rodzilla" either playing or missing out completely with Al Baxter's ability to play both tight and loosehead needed on the bench.

Prop Guy Shepherdson has done well enough for Connolly to stick with him if he's not convinced Blake is ready.

"Shepherdson is improving and Rodney Blake hasn't played for a month," said Connolly, who is rebuilding Australia's scrum which is very inexperienced internationally compared to the Kiwis.

"Baxter is more a loosehead tighthead reserve so it probably comes down to (a choice between) Blake or Shepherdson," said Connolly.

If that's Connolly's thinking, then Blake will either be recalled or miss out on the 22-man squad.

After being stood over by the New Zealand scrum in the 32-12 drubbing at Christchurch's Jade Stadium earlier this month, the Wallabies hit back impressively with a Tri-Nations record 49-0 demolition of South Africa.

Connolly has a full complement of Wallabies available after lock Dan Vickerman, a valuable lineout asset and hooker Tai McIsaac both completed the full training session.

"We'll have to see how he (Vickerman) pulls up and how sore it is tomorrow morning," said Connolly, keeping his selection cards close to his chest.

"He's important (to the lineout) but Mark Chisholm did very well when he went on last week.

An All Black win would virtually kill off the Tri-Nations contest whereas an Australia win would open up the contest.

"You'd probably think if the All Blacks win this and they've won three and the Springbok haven't won one, then they'd be in a pretty strong position," said Connolly.

"They've still got to play two in Africa yet and Africa has given them a hard time traditionally.

"If we win on Saturday night, then everyone is in the race again."

Winger Lote Tuqiri believes the All Blacks are beatable provided Australia plays to its potential and sticks to its game plan which it didn't do in Christchurch when the All Blacks comprehensively outplayed them.

"We weren't on the front foot in Christchurch and we probably weren't getting the ball that we wanted but kudos to the All Blacks pack for the way they shut us out on the night.

"We're trying to link the forwards and the backs and give the forwards the confidence to pass which we probably haven't done in the past.

"If we can get on the front foot this time hopefully we can showcase some of the talent we do have in the backs."

Tuqiri said there were always areas where teams were vulnerable, even the All Blacks.

"Obviously I'm not going to reveal where but our coaching staff have done a bit of homework and I think if we come out with a plan and stick to it, we'll go alright," he said.