The NRL will join forces with the DonateLife network to commemorate Jersey Day on Friday, with the sporting community encouraged to don a jersey to raise awareness for organ donation.

Nathan Gremmo was 13 when he was critically injured while crossing the road near his home in Sydney's North West in 2015.

An avid Parramatta Eels fan and Hills District Bulls junior, Nathan's family made the decision to donate his organs – instantly saving the lives of others.

"Nathan saved six lives, including a baby, so it's some peace of comfort that we get from the day and the ongoing support," Nathan's father Michael said at Eels training on Tuesday.

"It's important to register your donation decision and to discuss your decision with your loved ones. Nine in ten families agree to donation when their loved one is a registered donor. More lives can be saved if more Australians register to save lives."

Now in its third year, The Gremmo family began Jersey Day in September 2015 and the initiative has gathered momentum across all sporting codes in Australia.

"You can no longer register your donation decision on a drivers licence," Michael stressed.

"If you are willing to one day save lives, you need to join the Australian Organ Donor Register at donatelife.gov.au. It takes less than a minute.

"Three years later it's unbelievable all the support we've had from the NRL community and other sports, schools and workplaces," Michael said.

"We're hoping to save more lives each year."

Coincidently, Nathan's side Parramatta will meet the South Sydney Rabbitohs on Friday night, and the dress code is simple for September 1.

"We'd love to see everyone on Friday don their favourite jersey regardless of the code," Michael said.

"The main thing is to start that conversation."

For more information, visit jerseyday.com.au or to register your decision to save lives visit register.donatelife.gov.au