Brumbies centre Pat McCabe's wretched injury run continued when he sustained a head knock in his side's 15-11 loss to the Highlanders in Friday's warm-up game in Queenstown.
It was McCabe's first game since breaking his neck for the second time in seven months last season. The 25-year-old Wallaby was taken off in the 15th minute following a knock from behind while he had his head down.
Brumbies head coach Stephen Larkham said he was unsure how long McCabe would be out of action.
"We'll have to be very careful," he told AAP.
"Concussions are very serious. We'll follow the protocols and make a decision.
"But he had a strong 15 minutes, carried the ball well and made a couple of breaks."
There was good news for last year's Super Rugby runners up however. McCabe's fellow Wallaby, openside flanker, David Pocock played for an entire half in his first game back since last year's season-ending knee injury.
"He went well, got himself involved and didn't look like he was thinking about his knee at all," said Larkham.
Despite the defeat, Larkham said he was pleased with his side's performance, in what was his first game since taking over reins from Jake White, who left the Canberra-based franchise to coach the Sharks last year.
"They kicked five penalties to win the game, so we're happy that our defence held out," added Larkham.