Rampaging Springboks hooker Bismarck du Plessis may not be starting against the Wallabies this weekend but he will still want to "hurt" them.

Du Plessis' older brother Jannie, who will start at tighthead prop this Saturday, warned that his hooking sibling had a point to prove after being controversially red-carded against the All Blacks in Auckland last week.

"I know that if he gets two minutes he'll fire, because after 80 minutes against the All Blacks he felt responsible for letting the team down," du Plessis said.

"I know he never intended to injure somebody and he never intended to be malicious, but he did intend to hurt him, if I can say that."

The red card was later withdrawn against Bismarck du Plessis after one of his two yellow-card offences - a tackled on Dan Carter - was ruled to be within the laws of the game.

But the second offence, an elbow in the throat of All Blacks back rower Liam Messam, was upheld.

Springboks coach Heyneke Meyer has maintained the selection of Adriaan Strauss at No.2 on the weekend, relegating du Plessis to the bench, was his stated intention from the start of the Rugby Championship and had nothing to do with last week's incidents.

But Jannie du Plessis said his brother was still hurting almost a week after the All Blacks match and would play "out of his skin" if given the opportunity off the bench against the Wallabies.

"We do play a physical sport, you want to impose yourself physically on your opponent, but I don't think there was any malice in it and I don't think it was anything sinister," he said.

"Getting red carded, I know he really feels responsible for not only letting the team down but the whole of South Africa, because we knew how important that game was for us.

"From his point of view, he would really want to come on and play out of his skin and really make a big difference."

The veteran prop and qualified doctor will play his 50th Test match at Newlands. The Springboks are running second to New Zealand on the Rugby Championship ladder and need a bonus-point win this weekend to stay in touch ahead of the deciding match in Johannesburg next week.

He said he expected Australia to hit their stride at set piece at some point after struggling to adapt to the new laws, which came in for the Rugby Championship.

"It's happened to us in the past as well, in 2009 our pack were more or less the same people, people I really respect and really rate, but we struggled," du Plessis said.

"I recall a game against Leicester where we really got smashed. The guys who played that day were really capable players, so sometimes you just need the flow or the rhythm and the pack needs to play together.

"I think it's just a few things they have to tweak and they know what to work on and they'll probably sort it out."

South Africa: Zane Kirchner; Willie le Roux, JJ Engelbrecht, Jean de Villiers (capt), Bryan Habana; Morne Steyn, Fourie du Preez; Duane Vermeulen, Willem Alberts, Francois Louw; Flip van der Merwe, Eben Etzebeth; Jannie du Plessis, Adriaan Strauss, Tendai Mtawarira. Reserves: Bismarck du Plessis, Gurthro Steenkamp, Coenie Oosthuizen, Juandre Kruger, Siya Kolisi, Ruan Pienaar, Patrick Lambie, Jan Serfontein