Brumbies fly-half Matt Toomua will join the Canberra-based outfit for Saturday's clash with the Lions in Johannesburg.
Toomua, who has missed the past four weeks due to an ankle injury, will arrive in Johannesburg on Tuesday as the Brumbies hope to end a five-match losing streak.
They suffered a gut-wrenching 25-24 defeat to the Stormers in Cape Town on Saturday and coach Stephen Larkham has urged his players to stick to their systems in a bid to turn such narrow losses into victories.
Despite their poor run of form, the Brumbies are still at the top of the Australian Conference – with 33 points from matches – although they are just a point ahead of the Waratahs who have a game in hand.
Larkham knows this weekend's clash against the Lions is a make-or-break encounter for his charges and he hopes they finally turn the corner as five of their six losses suffered this season were by less than seven points.
"You've got to stay with it; had those tight games gone the other way we're on 49 points on the ladder," he told the Canberra Times.
"We know we're almost there. You change a few things but don't make wholesale changes.
"It's definitely a frustrating season, we're lucky to be on top of the Australian conference. We've said 'what if'. But the season's not over.
"We'll look back at moments that could have turned the season for us."
The Brumbies were demolished in the scrums against the Stormers and Larkham identified the set-piece as an area of concern.
"The Stormers have one of the best scrums in the competition … the dominance they had in the scrum hurt us," he added.
"They were better than us in the scrum, there's no hiding from that."
Brumbies captain Stephen Moore couldn't hide his disappointment after the loss to the Stormers.
"The effort is there, that's a starting point," he said.
"We've got to have some honest conversations around the scrum, no one part of the game is bigger than the other.
"Part of the culture of the team is being honest with each other.
"We're just going to have to work on it. We've certainly had enough admirable losses … we're not going to sugar-coat it. It's a loss and we're gutted."