Australian captain George Gregan will be among a host of key Wallabies coach Eddie Jones will rest next weekend after running up a record victory over Romania.

Gregan sustained a cork to his right thigh in the first-half of the 90-8 World Cup thrashing and did not reappear after half-time.

He was replaced by versatile rookie Matt Giteau who crossed for one of the 13 tries piled on by the rampant Wallabies.

But Giteau will not wear the No.9 jersey in Adelaide on Saturday against Namibia, with Jones stating Gregan's normal back-up Chris Whittaker would "most definitely" start.

The coach said he would give game time to all six players who had yet to run on in either of the Wallabies' two pool A victories, meaning a number of front-liners will be rested.

Outside centre Stirling Mortlock played 30 minutes off the bench in his first Test this year and Jones indicated he would be given more time against Namibia.

Apart from Gregan, vice-captain Phil Waugh was the only other minor injury concern after suffering a back spasm.

The back-rower was replaced by winger Lote Tuqiri who relished his time at flanker, wrestling over for a 74th minute try.

Three minutes later George Smith scored to equal Australia's biggest winning margin of 82 points, set in 2001 when the Wallabies thumped Spain 92-10.

The 13-tries-to-one cakewalk easily surpassed Australia's previous biggest World Cup score and winning margin which it set in 1999 by beating Romania 57-9.

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