Joe Schmidt said he cannot recall ever being involved in a more "bizarre" Test as his Australia side were downed 30-12 by South Africa in the Rugby Championship.

Malcolm Marx touched down twice for the Springboks in rainy Perth to make it two from two in the tournament but the Wallabies were hit by a swathe of injuries.

Front-row pair Allan Alaalatoa and Angus Bell were unable to return for the second half and scrums went uncontested after replacement prop James Slipper failed a head injury assessment.

The Wallabies even went down to 14 briefly when hooker Josh Nasser went off injured, though they did return to a full 15.

Reflecting on the unfortunate series of events, head coach Schmidt told Stan Sport: "It's probably one of the most bizarre games I've ever been involved in.

"In over 100 Test matches that I've been involved in I've never had a situation like that before. It happened so early in the game as well. When Slips got a head knock right after half-time.

"And then we were straight down. And then we played with 14 for a period of time before the officials worked out that we were still entitled to have a full pack because of the HIA.

"But I still am proud of the way that the guys fought their way through that second half. And the way that they stayed in the fight in the first half. It could have been, and I know it could have been as easy to say, but it could have been 12-11 at half-time and that would have been a massive lift for the boys."

Australia are winless through their first two matches, both against the Springboks, and will next face Argentina in La Plata on August 31.