Sydney- Scrumhalf Will Genia will captain the Wallabies against South Africa this weekend after James Horwill was ruled out through injury, the Australian Rugby Union said on Thursday.
GALLERY: 10 Bok games in Oz
VIDEO: Bismarck's 50 Test caps
VIDEO: Heyneke explains selections
Regular skipper Horwill will miss Saturday's Rugby Championship Test in Brisbane after scans revealed he had strained his left hamstring during Tuesday's training.
The ARU said Kane Douglas will replace Horwill and line up alongside fellow lock Rob Simmons, while Western Force backrower Ben McCalman was named as a new forward replacement on the bench.
Genia has skippered the Wallabies on three previous occasions, most recently leading the team to a 26-19 victory over South Africa in Perth last September.
"Will is a proven leader and has had plenty of success as captain for the Reds and also for Australia," Wallabies coach Ewen McKenzie said.
"He is a player that thrives with the added responsibility and he has always stepped up when given the opportunity to lead. I'm sure this will bring the best out of him.
"It's extremely disappointing to lose James but after discussions with medical staff we felt it was important not to risk further injury when he isn't ready."
McKenzie said he expected Horwill to be available for the two-game tour of South Africa (September 28) and Argentina (October 5).
15 Israel Folau, 14 Nick Cummins, 13
Adam-Ashley Cooper, 12 Christian Lealiifano, 11 James O'Connor, 10 Quade
Cooper, 9 Will Genia (captain), 8 Ben Mowen, 7 Michael Hooper, 6 Scott Fardy, 5
Kane Douglas, 4 Rob Simmons, 3 Sekope Kepu, 2 Stephen Moore, 1
Substitutes: 16 Saia Faingaa, 17 Scott Sio, 18 Ben
Alexander, 19 Ben McCalman, 20 Jake Schatz, 21 Nic White, 22 Matt
Toomua, 23 Jesse Mogg
Kirchner, 14 Willie le Roux, 13 JJ Engelbrecht, 12 Jean de Villiers
(captain), 11 Bryan Habana, 10 Morné Steyn, 9 Ruan Pienaar, 8 Duane
Vermeulen, 7 Willem Alberts, 6 Francois Louw, 5 Flip van der Merwe, 4
Eben Etzebeth, 3 Jannie du Plessis, 2 Bismarck du Plessis, 1 Tendai
Substitutes: 16 Adriaan Strauss, 17 Gurthrö Steenkamp,
18 Coenie Oosthuizen, 19 Juandré Kruger, 20 Siya Kolisi, 21 Jano
Vermaak, 22 Pat Lambie, 23 Jan Serfontein