Summary Note: Ages, caps and clubs/franchises are of 19 August 2017 – the starting date of the tournament
Argentina On 20 July 2017, Argentina named a 33-man squad for the Championship. 1 On 22 August, Felipe Arregui was added to the squad as injury cover for Nahuel Tetaz Chaparro who was injured in the opening round of the Championship.
Australia On 19 July, Michael Cheika named a 38-man extended training squad ahead of the Championship. Brumbies players were left out of the initial squad with their involvement in the quarter-finals of the
2017 Super Rugby season. On 26 July, Cheika added seven Brumbies players to the squad following their conclusion in the Super Rugby. On 4 August, Cheika named Australia's final squad for the Championship, reducing the squad from 45 to 34.
Jermaine Ainsley,
Sam Carter,
Pekahou Cowan,
Sef Fa'agase,
Richard Hardwick and
Campbell Magnay missed out on the squad, while
Karmichael Hunt,
Tolu Latu,
Eto Nabuli and
Sefa Naivalu was omitted due to injury.
Taniela Tupou still ineligible for international duty. 1 On 1 September, Tolu Latu was called up as cover for Stephen Moore, withdrew for personal reasons, ahead of the third-round game against South Africa. 2 On 7 September, Dane Haylett-Petty was ruled out for the rest of the Championship due to injury. He was later replaced by Tom Banks on the 10 September. 3 On 11 September, Lukhan Tui was added to the squad ahead of the fourth round, replacing Kane Douglas was dropped from the squad.
New Zealand New Zealand's 34-man squad for the Championship. Damian McKenzie was named in the squad as a later replacement for Ben Smith who goes on a sabbatical following the opening two rounds. 1 On 10 August, Jordie Barrett withdrew from the squad due to injury and was replaced by David Havili. 2 On 13 August, Dane Coles was ruled out of the first round of the Rugby Championship and Ricky Riccitelli was called as cover. 3 On 20 August, Kane Hames, Akira Ioane and Atu Moli temporarily joined the squad ahead of the second round of the Championship. 4 On 24 August, Jeffery Toomaga-Allen was called up to the squad after Owen Franks was ruled out of the second-round game against Australia. Franks was later ruled out for the remainder of the Championship. 5 On 4 September, Blake Gibson was called up to the squad as injury cover for Sam Cane. 6 On 10 September, Joe Moody was ruled out for the remaining matches in the Championship and Kane Hames was recalled as his replacement. 7 On 18 September, Matt Todd and Patrick Tuipulotu were added to the squad for the final two rounds, away to Argentina and South Africa.
South Africa On 5 August, coach Allister Coetzee named a 34-man squad for the Championship. 1 On 14 August, Ruan Dreyer was called up as injury cover for Frans Malherbe who could miss the whole Championship. 2 On 20 August, Jano Vermaak was called as injury cover for Ross Cronjé after Cronjé suffered an ankle injury in the opening round. 3 On 9 September, Coenie Oosthuizen was ruled our for the rest of the tournament after sustaining an injury in the third round. Wilco Louw was called up to replace him. 4 On 20 September, Francois Louw, S'busiso Nkosi and Louis Schreuder were added to the squad, with Louw and Schreuder replacing Jaco Kriel and Francois Hougaard in the squad. ==See also==