Coach Jake White says he's benched the veteran flanker because ''it's the best call for our team going forward''.

Young gun Colby Faingaa will start ahead of Smith at openside for the Brumbies' last regular-season game against the Western Force in Perth on Saturday night.

The selection follows concerns about Smith being knocked out just four minutes into his Test comeback last weekend and allowed to return to the field in the Wallabies' loss to the British and Irish Lions.

Smith was allowed back on to the field only after being cleared by three independent doctors, one of whom was Brumbies medico Angus Bathgate.

White said the decision to bench Smith wasn't a precautionary move, but a reward for Faingaa for his efforts in the past two months.

''I've got to make sure everyone is on the same page - [Smith's] not on the bench because of what happened last Saturday, he's on the bench because it's the best call for our team going forward,'' White said. ''It's not a precaution thing at all, George will get on the field. I think the touchiness is over-sensitive because it was George's comeback, there was a lot of hype involved.''

Former Wallaby Peter FitzSimons labelled the International Rugby Board's concussion rules a ''disgrace'' following Smith's injury. FitzSimons criticised the process to assess knocked out players and the IRB, not Smith or the medical staff involved.

''This new [IRB concussion] rule is as ludicrous as it is dangerous and the case of George Smith proves it to be so,'' wrote in his Fairfax Media column.

Smith trained with his Brumbies teammates this week, while some of the club's other Wallabies representatives, including skipper Ben Mowen, were rested from sessions.

White said 32-year-old Smith's concussion was not a factor in putting him on the bench and wants the Australian rugby great to be fully fit for the club's finals campaign. Smith has played just one game since injuring his knee in May, which was his comeback test for the Wallabies.

''We're going to need George going into the big [finals series] games … I'm going to need him to be 100 per cent,'' White said.

''Our doctor [Bathgate] was actually the [Test] match doctor as well. He's a very conservative doctor and he would never have been gung-ho about a decision like that [letting Smith back on the field]. And secondly, I have no doubt that George himself wouldn't have gone back out onto the field if he didn't feel he was 100 per cent right.''

The Brumbies have named a near full-strength line-up for the clash with the lowly ranked Force in a sign they are still gunning for a top-two finish on the ladder instead of resting players.

Scrum-half Nic White won't play as he continues his recovery from a shoulder injury, but is expected to play in the finals next week.

Test players Mowen, Jesse Mogg, Stephen Moore, Ben Alexander, Joseph Tomane and Christian Lealiifano will all line up on Saturday night.