Pone Fa'amausili and Hunter Paisami have been stood down pending the outcome of a police investigation into the alleged incident in the early hours of Sunday morning.
A Facebook post from a woman claiming to be the sister of the victim accused the pair of delivering a "king hit" to her brother from behind, causing him to lose consciousness and leaving him to bleed on the ground.
The Rebels confirmed Fa'amausili and Paisami had been stood down and that Rugby Australia had been made aware of the developments but did not offer any comment.
