The star of Collingwood's sister, Travis Varcoe, dies after the football game

Travis Varcoe of the Magpies is seen in action during the Round 21 AFL match between the Collingwood Magpies and the Brisbane Lions at Etihad Stadium in Melbourne, Saturday, August 11, 2018. (AAP Image/Julian Smith) NO ARCHIVING, EDITORIAL USE ONLY

The sister of Collingwood star Travis Varcoe died four days after suffering a head injury during a football game.

The 27-year-old woman was admitted to the hospital on Sunday after accidentally colliding with a teammate while playing for Angle Vale Football Club in a great women's final of the Adelaide Football League.

He reportedly walked off the ground after the collision in the field, but collapsed in the locker room and was in a coma at the Royal Adelaide Hospital before dying on Thursday.

Varcoe returned to Melbourne to address his teammates on Tuesday before flying back to Adelaide late Wednesday to watch by his sister's bed.

SBS News has not named or shown a photo of the woman who died for cultural reasons.

The news of his death was confirmed in a Facebook post by Angle Vale on Thursday night.

"You were a very dear member of our women's team that idolized you both on and off the field," he said.

"Your infectious smile and friendly nature will be truly missed at the club you chose to call home, and we will do everything we can to support the Varcoe family and the AVFC family who are deeply saddened by this tragedy."

Adelaide Football League CEO John Kernahan told The Advertiser that he was shocked by the news.

"Like everyone in the football community, we are devastated by the tragic loss (…) after what seems to have been a rare accident on Sunday," Kernahan told the newspaper.

"[She] We received the best medical care, both in the field and at the Royal Adelaide Hospital, and we thank all the medical professionals who did so much for her.

"We have been in constant contact with the Angle Vale football club and our thoughts and my deepest condolences go to the Varcoe family, [her] friends and teammates. She was a talented, energetic and passionate young woman who absolutely loved her.

"I know I speak for the entire football community when I say that they loved her a lot in return.

"The football community is strong and we will put our arms around those who need a bit of care."