Just months after Christian Lealiifano and Matt Toomua went head to head for a World Cup berth, Larkham will experiment with the pair in different chief playmaker roles in the club's pre-season trials.

Lealiifano is set to turn down offers from rich overseas club to re-sign with the Brumbies, and it's understood a deal could be finalised as early as Monday.

But Larkham is more focused on how his back line will look when the Super Rugby season begins, backing a new bonus-point overhaul to encourage constant attacking rugby.

Lealiifano and Toomua have both held the Brumbies' No.10 jersey at different times, however, both are considered inside centres when it comes to Wallabies selection.

Larkham will wait until after the trials against the NSW Waratahs and the Queensland Reds to settle on who gets the five-eighth duties.

Lealiifano thrived at five-eighth to lead the Brumbies' finals charge while Toomua was considered the Wallabies' first-choice inside centre before Matt Giteau made his comeback.

"It's a pleasing situation to be in ... if you look at the backs and the trend in Super Rugby, there's a lot of versatility and that can only help you," Larkham.

"They've definitely got the skill set to play both flyhalf and inside centre equally, that gives us the ability to change slightly with whoever is there.

"They can both step up and take charge when needed, so we'll see how it goes through the trials."

The Brumbies are still working with Lealiifano on a deal that would keep him in Canberra while also having the flexibility to test himself in the Japanese competition.

Flanker David Pocock is also locked in negotiations, but it's unlikely a deal will be done before the start of the Super Rugby season.

Both Pocock and Lealiifano have fielded big-money offers from abroad as the Brumbies work to keep them in the capital.

Larkham will roll out some of his back-line weapons in the trial against the Waratahs in Wagga on February 6, with Lealiifano, Toomua and Tevita Kuridrani likely to get a chance to play.

The club's other Wallabies representatives will likely be held back for the hitout against the Reds the following week, with Larkham giving the entire squad a chance to impress.

The Brumbies want to deploy a more attacking game plan this season, and it falls in line with Super Rugby's governing body SANZAR's decision to change its bonus-point system.

In the past teams have been awarded bonus points for scoring four or more tries in a match.

That is set to change to instead reward teams who win by three or more tries in a bid to promote attacking rugby even when teams hold a comfortable lead.

Bonus points lifted the Brumbies into the finals last year after finishing equal on wins with the Canterbury Crusaders and Johannesburg Lions.

The Brumbies scored 45 tries last season, and boasted the best defensive record in the competition after leaking just 21 five-pointers.

"If [SANZAR] thinks it will promote attacking rugby, we'll back their decision and we'll try to make the most of it," Larkham said.

"What I do find is that if you're a team in front, you chase to get four tries. And if you're behind, but you've scored three tries, there's an emphasis to get the fourth.

"Yes, you want your defence to be better, but you want your attack to be the same as well. It doesn't just come down to attack these days."