Koroibete, who has signed with Melbourne Rebels after his stint in NRL, was included along with Kyle Godwin and Tolu Latu.
If he features in a Test, the 24-year-old Koroibete would be the first player since Tatafu Polota-Nau in 2005 to make a Wallabies appearance before a Super Rugby one.
Centre Samu Kerevi has missed out after undergoing surgery on an ankle injury.
The five-Test tour sees Australia take on Wales, Scotland, France, Ireland and England.