Brothers have been dealt another obstacle as they look to get their season back on track.
Influential centre Ethan Mackenzie is expected to miss the rest of the season after rupturing his anterior cruciate ligament in the win over Junee heading into the general bye.
Mackenzie is waiting on more medial advice but all indications are it is the second time in two years knee problems will put an end to his season.
"I was not expecting it to be that bad but looking back on it now the pain I was in was nothing I'd felt before," Mackenzie said.
"I haven't even thought about footy but just focusing on recovery."
Mackenzie suffered medial ligament damage in the same right knee last year and thought he had done it again before scans revealed much more damage.
It's far from what Brothers after last year's preliminary finalists went winless through the five rounds of the season.
They've had another draw and two wins since then but face a tough test against a Southcity outfit looking to rebound from their 34-0 loss to Gundagai in the grand final rematch.
Brothers are still uncertain on who will come into the centres to tackle the imposing Usaia O'Sullivan.
Assistant coach Joel Berrigan said Ben Schreiber and Liam Carey, who is expected to return from a hairline fracture to his jaw for the clash, are among the leading candidates.
Brothers sit a win outside the top five, and six points behind the third-placed Bulls, however Berrigan doesn't want to focus on their opponents at Harris Park on Sunday.
Instead they are looking to continue improve.
"I don't think this weekend is really about them," Berrigan said.
"They are a good football side and will always do what they do but it is more about us.
"We're not using them as a yard stick but instead have to challenge ourselves each week.
"We've got a good team and when we put it together we can beat anyone."
Nathan Rose and Jake Dooley are both in doubt for the Bulls with hamstring complaints.