The Brumbies have made a number of changes for their clash with the Waratahs in Sydney this Saturday.
Both alterations are forced following the two-match suspension of David Pocock and the retirement of Ita Vaea due to health reasons.
Jarrad Butler returns for the first time since the Brumbies round three clash against the Force and will start the match at openside flanker.
Butler has missed the Brumbies passed three matches due to a knee injury suffered at training in Cape Town.
Jordan Smiler will start the match at number eight, replacing Vaea. Smiler, a versatile back-rower has played in all of the Brumbies matches in 2016 and started in the number eight jersey in the Brumbies Round Three clash against the Stormers in Cape Town, following the injury to Butler.
With both Butler and Smiler starting, rookie Michael Wells returns to the bench. He made a brief appearance against the Stormers in Cape Town to record his Super Rugby debut and will return to Sydney for the first time since linking with the Brumbies on an Extended Playing Squad contract.
Ben Alexander will become the Brumbies third most-capped player in history when he takes to the field.
He currently sits equal with Stirling Mortlock with 123 appearances for the ACT-based franchise. Alexander made his Super Rugby debut in round three of the 2008 Super Rugby season against the Queensland Reds, scoring a try after coming on as a replacement.
Brumbies: 15 Aidan Toua, 14 Robbie Coleman, 13 Tevita Kuridrani, 12 Matt Toomua, 11 Joseph Tomane, 10 Christian Lealiifano, 9 Tomás Cubelli, 8 Jordan Smiler, 7 Jarrad Butler, 6 Scott Fardy, 5 Sam Carter, 4 Rory Arnold, 3 Ben Alexander, 2 Stephen Moore, 1 Scott Sio.
Replacements: 16 Josh Mann-Rea, 17 Allan Alaalatoa, 18 Les Leuluaialii-Makin, 19 Tom Staniforth, 20 Michael Wells, 21 Joe Powell, 22 James Dargaville, 23 Nigel Ah Wong
Date: Saturday, April 16
Venue: Allianz Stadium, Sydney
Time: 19:45 local (09:45 GMT)
Referee: Nick Briant
Assistant Referees: Brendon Pickerill, Michael Hogan
TMO: Ian Smith