Hunter Paisami and Pone Faamausili had admitted their involvement in a late-night incident in Melbourne, with Faamausili providing a statement to police on Sunday, a report on Rugby Australia's website said.
The allegations come a week after Rebels number eight Amanaki Mafi faced a court in Dunedin, New Zealand, after being charged for his part in a violent clash with team mate and Wallabies loose forward Lopeti Timani.
Prop Faamausili made his Rebels debut earlier this season and recently re-signed until the end of the 2020 season.
Centre Paisami, 20, has yet to make his senior debut.
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The Rebels had launched an internal probe into the incident and alerted the sport's national governing body Rugby Australia, a spokesman said.
The incident was brought to light by a social media post from a relative of the alleged victim, the Rugby Australia report said.
The allegations have added another sour note to a disappointing season for the Rebels, who narrowly missed out on the playoffs after being eliminated in the final round of the regular season.
(Reporting by Ian Ransom; Editing by Greg Stutchbury)
