Josh Dugan suffered a fractured cheekbone in Australia's resounding 30-12 Anzac Test victory over New Zealand on Friday, coach Mal Meninga confirmed.
Centre Dugan scored the opening try in Canberra when he leapt to claim Johnathan Thurston's kick, but he was forced off in the second half after a clash of heads with St George Illawarra Dragons team-mate Russell Packer.
The 26-year-old did not return to the action, with the injury casting doubt over his availability for the first match of this year's State of Origin series in Brisbane on May 31.
"Josh was nearly our best player in that first half, the whole team's defence was outstanding, but him on the right edge was fantastic," said Meninga.
"We believe it's a depressed fracture of the cheekbone.
"We haven't heard anything back from the hospital, we're just waiting on some news there, but his cheekbone is definitely broken."
The victory came in captain Cameron Smith's 50th appearance for the Kangaroos, placing him just nine Tests short of equalling Darren Lockyer's all-time record.
-- Australian Kangaroos (@Kangaroos) May 5, 2017
Menginga felt the landmark occasion for the hooker helped motivate his team-mates to produce a dominant performance.
"What a fantastic person, player, effort to get 50 games - the second person in our history in rugby league," he said.
"They played for him I thought, that's one of the reasons the team went really well. What a fantastic way to celebrate your 50th game."