Brumbies fly-half Matt Toomua has discussed the threat posed by former team-mates Zack Holmes and Ian Prior ahead of this weekend.
Holmes and Prior now ply their trades with the Force and will no doubt look to use any info they have on their old side to their advantage when the two sides meet on Friday.
"Zack and Ian (Prior) know our systems quite well, we heard them call out our plays during the trial match. They knew exactly what was going on. So we might change the calls, or just double bluff them, we'll have to wait and see…"
Toomua elaborated on Holmes by saying the two players know each other's strengths and weaknesses well having trained in close proximity to one another.
"He knows my game well. I know his game quite well," Toomua said. "Having that inside knowledge on a guy like Zack helps, and I'm sure he'd say the same thing about me. There's a mutual respect."
The Brumbies will also be looking to extend their four-point lead at the top of the Australia Conference as Toomua stressed the advantage of taking potential points off rivals sides in Australian derbies.
"Coming up against Australian teams always helps," added Toomua.
"It's much more than just a normal win. You're actually taking points off a team in your conference which is really important, especially a team like the Force who came so close to the finals last year."