Karyn Murphy Medal winner Kimiora Nati is set to undergo surgery on Friday for an ACL rupture and torn meniscus.
The Brisbane Broncos and Kiwi Fern star suffered the injury during her teams 26-24 loss to the Australian Jillaroos last month at Mt Smart Stadium.
She limped from the field in the opening half of the match after attempting to play on with the injury.
The 30-year-old was an integral part of the Broncos 34-12 victory over the Sydney Roosters inaugural NRL Women's Premiership grand final.
She now faces an indefinite period on the sidelines with the injury being reported as a nine-month recovery from the Broncos but coach Paul Dyer expects her to be back in time for the 2019 season.
"It is probably an example of where the timing of the competition will help us out," Dyer told broncos.com.au.
"Kimiora will have an operation to have a pretty standard repair of her ACL, as there doesn't seem to be any other issues around it.
"The full rehab around that surgery is nine months, which will put her back on the field for around the first trial," he said.
This announcement comes after centre Meg Ward had surgery for a disc replacement in her neck on Monday.
The 2019 NRLW season is expected to kick off in August.