“The whole club is devastated for ‘Braz’, who will sit aside for not one but two campaigns this year,” Collingwood’s general manager of women’s sport Jane Woodlands-Thompson said.
“With Braz being in the prime of her career, with Australian honours across both of her codes, the news is extremely disappointing.”
Gourlay ruptured the ACL in her right knee in a training mishap last week.
It is the third time the unlucky 20-year-old has suffered a serious injury to the same knee, having undergone two previous reconstructions, in 2015 and 2016.
“Another heartbreak for the club,” Woodlands-Thompson said.
“It’s hard to comprehend this is the third occurrence for Georgia.
“This is a case of extreme bad luck.”
Collingwood have lost their past two AFLW matches and will aim to get their season back on track when they take on Western Bulldogs in Morwell on Sunday.