Rising backrow star Isi Naisarani has been unveiled as the final piece of the Wallabies' Spring Tour puzzle, named as a squad development player.
Naisarani has been training as an unofficial member of the squad in Japan and his efforts have impressed the coaching staff enough to earn a spot alongside fellow development rookie Rob Valetini in the squad.
Hooker Tatafu Polota-Nau is the other addition to the squad once they land in the UK, with Wallabies coach Michael Cheika giving the rake some time off in England while the squad trained in Japan.
Brandon Paenga-Amosa and Jed Holloway are both returning to Australia after training and playing with the squad in recent weeks.
Holloway has battled niggles since joining the squad in Sydney and will be released from the group to recover.
Lock Adam Coleman is expected to be fit for the Wallabies' first Test in the UK after missing the third Bledisloe Test with a groin injury.
Coleman has trained fully during Australia's extra week in Japan, a positive sign ahead of their European tour.
The Wallabies flew to Wales on Saturday ahead of their November 11 Test in Cardiff.
Australia takes on Wales on Saturday November 10, kicking off at 5:20pm local, Sunday 4:20am AEDT, LIVE on beIN Sports and SBS.
IN: Tatafu Polota-Nau, Isi Naisarani (Development)
OUT: Brandon Paenga-Amosa, Jed Holloway
Wallabies updated Spring Tour squad
Jermaine Ainsley (1 Test, Melbourne Rebels, 23)
Allan Alaalatoa (30 Tests, Brumbies, 24)
Rory Arnold (19 Tests , Brumbies, 28)
Adam Coleman (28 Tests, Melbourne Rebels, 26)
Jack Dempsey (7 Tests, NSW Waratahs, 24)
Folau Fainga’a (6 Tests, Brumbies, 23)
Ned Hanigan (18 Tests, NSW Waratahs, 23)
Michael Hooper (c) (88 Tests, NSW Waratahs, 27)
Sekope Kepu (100 Tests, NSW Waratahs, 32)
Tolu Latu (10 Tests, NSW Waratahs, 25)
Tatafu Polota-Nau (86 Tests, Leicester, 33)
David Pocock (75 Tests, Brumbies, 30)
Izack Rodda (14 Tests, Queensland Reds, 22)
Rob Simmons (91 Tests, NSW Waratahs, 29)
Pete Samu (7 Tests, Brumbies, 26)
Scott Sio (52 Tests, Brumbies, 27)
Taniela Tupou (9 Tests, Queensland Reds, 22)
Adam Ashley-Cooper (116, Kobe Steelers, 34)
Tom Banks (3 Tests, Brumbies, 24)
Kurtley Beale (81 Tests, NSW Waratahs, 29)
Israel Folau (70 Tests, NSW Waratahs, 29)
Bernard Foley (65 Tests, NSW Waratahs, 29)
Will Genia (97 Tests, Melbourne Rebels, 30)
Jake Gordon (uncapped, NSW Waratahs, 25)
Dane Haylett-Petty (28 Tests, Melbourne Rebels, 29)
Samu Kerevi (22 Tests, Queensland Reds, 25)
Marika Koroibete (18 Tests, Melbourne Rebels, 26)
Jack Maddocks (5 Tests, Melbourne Rebels, 21)
Sefa Naivalu (8 Tests, Melbourne Rebels, 26)
Jordan Petaia (uncapped, Queensladn Reds, 18)
Nick Phipps (70 Tests, NSW Waratahs, 29)
Matt Toomua (39, Leicester/Melbourne Rebels, 28)
Rob Valetini (uncapped, Brumbies, 20)
Isi Naisarani (uncapped, Melbourne Rebels, 23)