Keep repeating his dominant performance against the Cape Town Stormers.

Upholding his vow to leave nothing left in the tank ahead of his move to French Rugby, he's been a beacon for the Brumbies' attack as they grind through their tour of South Africa and Argentina.

As the Brumbies defended their way to a stunning 19-17 triumph over the Stormers last Saturday, it was 28-year-old Arnold who set the tourists off to a flying start at Newlands Stadium.

Using his 208-centimetre frame to great advantage, Arnold set up Pete Samu for the opening try and then chased down a clearing kick to score one of his own just moments later. And it all happened in the first 10 minutes.

While all eyes were focused on the Brumbies' brutal defensive wall which made 239 tackles to the Stormers' 90, former Wallaby Owen Finegan said Arnold's leadership in the attacking line has been pivotal to the team's recent success.

"Looking at the game he played against the Stormers he was quite dominant, really physical, he scored a good try, and he's athletic. I thought it was a really good performance," Finegan said.

"He just needs to keep leading, backing those up and making sure that the Brumbies are continuing to win, continuing to dominate."

Wallabies and Brumbies great Rod Kafer also praised Arnold for his overseas performance.

"He's been in fantastic form, particularly in the way that he has been carrying the ball," Kafer said.

The 19-cap Test forward played in four Rugby Championship matches last year but his spring tour was cut short by a fractured cheekbone.

But Arnold will be chasing down his last chance of earning a Wallabies recall ahead of the World Cup.

The reigning Brumbies player of the year will join Toulouse following the tournament in Japan, making him unavailable for international selection in 2020.

While he's been in and out of the Wallabies' 23 since making his debut in 2016, Finegan believes now having Scott Johnson and Nick O'Connor on the selection panel could work in his favour.

"There's going to be some fresh ideas and thoughts into the selection of the Wallabies come at the end of the Super Rugby season. So if you're performing, you're giving it your best shot," Finegan said.

"There's two more months of rugby so he needs to continue what he's doing and he has been playing really strongly and leading the way. All Rory can do is keep playing well, be consistent and perform."

With the Brumbies looking for their third consecutive win, Finegan said a victory over the Jaguares would improve their chances of topping the Australian conference.

"It's difficult to play away from home. They've done that once already so it's a matter of continuing that form," Finegan said.

"When you're away and you're touring in South Africa and now Argentina, it's challenging to be moving around, training and trying to freshen themselves up. So it's less about physical training and getting components of their game ready for the Jaguares.

"If they can win games away as well as winning those Australian derbies, then they will set themselves up on top of the Australian conference."

SUPER RUGBY ROUND 11

Sunday: Jaguares v Brumbies at Estadio José Amalfitani, 7.40am. TV: Live on Fox Sports.