"He was limping around today so he's in a bit of pain," added Larkham.
"Coming back from a syndesmosis ... everything is cleared medically, it's just whether he feels good tomorrow, which I suspect he will."
The Brumbies are preparing for another physical game against the Stormers, to whom they lost 25-24 at Newlands in May. A missed Christian Leali'ifano kick proved the difference and left the No10 devastated. But he says he isn't out to seek redemption.
"I hadn't thought about that kick until now - so, thanks," said Lealiifano with a laugh on Tuesday.
"I just think it's a fantastic opportunity we have here to play some finals footy and progress."
Larkham said he had every confidence in Lealiifano and lauded his resolve to improve. "Particularly since that miss, Christian's spent more time at training practising his conversions and penalty kicks," the coach said.
"I think we've seen a bit of a turnaround over the last month in his goal-kicking - last weekend he kicked really well."
Nevertheless, Larkham said his side would take extra care with their option-taking when awarded penalties against the Stormers, given a semifinals berth is on the line.
The Brumbies have lost four times this season by three points or less. "We'll be treating it like a test match. We'll be very careful with the decisions that we take at penalty times.
"I'm sure [captain Stephen Moore] will make good decisions on the night as he's done over the last month." AAP