Eamon Davie was working on the door of the Carlton Club when the attack unfolded and rushed to the scene where he tried to save the restaurateur's life.

His sister Jackie told radio 3AW on Tuesday she launched the online campaign for her "hero" brother, a university student and casual doorman, to help pay his bills over the next couple of months while he recovers from the traumatic event.

"He was just starting work on the door and he saw the car coming down the road and saw the guy jump out of it and he was just running at people," Jackie said.

"My brother's first instinct was to run back into the Carlton Club and lock the doors to lock all the other people inside."

He called Triple 0 then ran to the wounded restaurateur who'd been fatally stabbed and desperately tried to resuscitate him.

"He doesn't see himself as a hero, because in his eyes, he didn't save him," she said.

Jackie said her brother won't ask for help, but he has bills to pay and she does not want him to return to work before he's ready.

"If he's not working, he's not getting paid," she said.

She has set a $5000 fundraising target.

Another crowdfunding campaign launched for the homeless man dubbed "trolleyman" who helped police during the Bourke Street attack has now raised more than $133,000.

Michael Rogers, 46, used a shopping trolley to ram Hassan Khalif Shire Ali as police officers tried to disarm the Somali-born radical before fatally shooting him on Friday.

Australian Associated Press