ACT Brumbies duo Toomua and Mogg were axed from the starting 15 on Wednesday as the Wallabies aim to continue their dominance over South Africa in Brisbane on Saturday.

Controversial star Quade Cooper will take over from Toomua at five-eighth while code-hopper Israel Folau moves to fullback in place of Mogg.

Toomua and Mogg had a rough initiation to international rugby, losing two Tests to world champion New Zealand last month.

Jones was happy for McKenzie to tinker with his line-up, but the 2003 World Cup coach said ''chopping and changing'' combinations was dangerous. ''Ewen has to find his best team and a consistent No10 … going forward you have to settle on a [five-eighth] and stick with someone to give them some experience,'' he said.

''At the moment it looks like he's trying to find out who that is. [Toomua and Mogg] played against the best team in the world and struggled in areas, but that's to be expected.

''I don't think they should be written off, they deserve another chance. I'm sure Ewen won't write them off.

''In those positions at [five-eighth] and fullback, you need time to find your feet in Test rugby and I don't think chopping and changing helps a lot.''

Cooper is back in the starting team for the first time in almost 12 months. Folau will be playing his fifth Test and his first international match as the starting fullback.

Mogg and Toomua were outstanding for the Brumbies in the Super Rugby season and were vital cogs in the team which made it to the grand final last month.

However, their Super Rugby form hasn't immediately transferred to the Test arena and McKenzie has opted to inject new blood as the Wallabies search for their first win of the Rugby Championship.

Mogg admitted earlier this week his matches against the All Blacks were two of his worst games of the year. But Brumbies backs coach Stephen Larkham is adamant Mogg and Toomua will get another chance to star in the gold jersey.

''They've had a pretty good start to their international career and they're going to have a lot more games for the Wallabies,'' former Wallabies five-eighth Larkham said. ''I can see them playing a number of games this year. There's a lot of learning and experience for them to get.

''I thought they both made massive improvements from game one to game two and they proved they're capable at that level. We'll definitely see them there in the future.''