The Brumbies are determined to add greater discipline to their attacking flair when they face a Stormers team boasting the Super 14's most miserly defence on Friday (early Saturday AEDT).

The Stormers are one of just four unbeaten teams after two rounds, having vanquished both the Lions and the NSW Waratahs at their home ground, Newlands, in Cape Town.

Renowned for their attack, especially following the acquisition of Springboks backs Bryan Habana and Jaque Fourie, the Stormers have caught the eye with their defensive efforts.

In a tournament which has produced an increase in scoring, they have conceded just one try and only 19 points, after the first two rounds.

They restricted a near Test-strength Waratahs backline to just two penalty goals last weekend.

"Defensively they are very good, they get off the line quite hard around the park," Brumbies five-eighth Matt Giteau said.

With eight of their next nine games in Australia, seven of them in Canberra, the Brumbies can set up their season with a victory at Newlands.

"We would've liked to have had three wins in the first three away games, but if we can get two and then we've got a lot of home games, that should hold us in good stead," Giteau said.

Brumbies forwards coach Owen Finegan said the Australian side hadn't spent much time early this week analysing the Stormers and had instead addressed their own deficiencies in the 50-32 loss to the reigning champion Bulls in Pretoria.

"The focus for this week has been on our ourselves, we were beating the Bulls by seven points and let ourselves down a little bit in terms of discipline by giving them seven penalties in a row," Finegan told AAP.

"All of them were very avoidable.

"The boys have really trained well this week and our focus has been on getting our structure right.

"The Stormers have got lots of talent across the park and there are definitely players there that are a massive threat to us."

One threat the Brumbies won't have to defuse is Stormers' skipper Schalk Burger who has been ruled out with a hamstring niggle he suffered in the clash with the Waratahs.

His absence wipes out a bone-jarring confrontation with the Brumbies own hard-running blindside flanker Rocky Elsom.

"We will have to wait and see how much it (Burger's absence) takes a toll...but you would think he will be missed," said Elsom, who made a barnstorming Brumbies debut against the Bulls.

Giteau stressed the need for the Brumbies to produce longer periods of the promising play they produced against the Bulls.

"There was a period there in the first half where we played some great football, but we've got to be able to do it for a full eighty minutes if we're going to compete against the good sides," Giteau said.

Brumbies coach Andy Friend made just one change to his starting side, with lock Ben Hand replacing veteran Justin Harrison in the second row.

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