The Rebels have signed back-rower Lopeti Timani from the Waratahs for the 2014 and 2015 Super Rugby seasons.
Timani initially pursued a rugby league career with the Canterbury Bulldogs, playing 24 games for their U20 side in 2009 and 2010.
He played in all but two matches for the Waratahs in 2012, catching the eye of Rebels scouts with some solid performances off the bench this season.
The 22-year-old turned down several offers from European clubs before officially committing to the Rebels last week.
Rebels boss Damien Hill said that the signing was in alignment with the direction the young squad is headed.
"At only 22, Lopeti is a player with enormous potential," said Hill.
"He has played both number eight and blindside flanker over the past two seasons, and at such a young age will only continue to develop.
"Lopeti has ambitions to represent the Wallabies, and sees a pathway to this goal through the Rebel Rugby program."
Timani, brother of Wallaby, Sitaleki, will join the Rebels at the beginning of their off-season later in the year.