Currently the boss of Scottish club Glasgow Warriors, Rennie has agreed a three-and-a-half-year deal as Australia's new head coach and will join the Wallabies at the end of the current UK season.
"I've got a bit of work to do from an Australian perspective," said Rennie, who was appointed in the wake of Michael Chieka's departure following the Wallabies' World Cup quarter-final exit.
"We're sorting out staff, not just coaches but the whole staffing group, and it's an extensive review.