Koch earns Springbok start in Salta
South Africa face Argentina in Salta on Saturday in the second round of the Rugby Championship.
Koch, who has three Test caps to his name, comes in for Redelinghuys who has been ruled out of action with a hamstring injury he sustained in the first Rugby Championship Test in Nelspruit last Saturday, won by the Boks by 30-23.
With Koch drafted into the starting line-up, Lourens Adriaanse moves onto the bench as one of the two replacement props for what could be his second Springbok cap.
Loosehead prop Tendai Mtawarira will equal Os du Randt's record as the most-capped prop for South Africa.
Also amongst the replacements, the Springboks have opted for the experienced Morné Steyn, who will give the team an extra kicking option, in place of Juan de Jongh.
The rest of the Springbok line-up remains unchanged from the one that defeated the Pumas at the Mbombela Stadium.
In keeping changes to a minimum, Springbok coach Allister Coetzee has opted for continuity against a Pumas side that will be lifted by their passionate home support.
"Vincent did very well when he came on as a replacement for Julian in Nelspruit, and he is rewarded with a starting berth, while we believe it would be good to give Lourens an opportunity on the bench at this stage," said Coetzee.
"We expect them to try and put us under pressure with their tactical kicking. Morné is an experienced player with good kicking attributes, and he will provide an additional kicking cover for us.
"We will continue to build on our cohesion as a team. This is the first away Test for this side and we expect another huge battle against the Pumas."
The Springboks will continue with their preparations in Buenos Aires before flying out to Salta on Friday.
South Africa: 15 Johan Goosen, 14 Ruan Combrinck, 13 Lionel Mapoe, 12 Damian de Allende, 11 Bryan Habana, 10 Elton Jantjies, 9 Francois de Klerk, 8 Warren Whiteley, 7 Teboho Mohoje, 6 Francois Louw, 5 Lodewyk de Jager, 4 Eben Etzebeth, 3 Vincent Koch, 2 Adriaan Strauss (captain), 1 Tendai Mtawarira.
Replacements: 16 Bongi Mbonambi, 17 Steven Kitshoff, 18 Lourens Adriaanse, 19 Pieter-Steph du Toit, 20 Jaco Kriel, 21 Rudy Paige, 22 Morné Steyn, 23 Jesse Kriel.
Date: Saturday, August 27
Venue: Estadio Padre Ernesto Martearena, Salta
Kick-off: 16.40 (21.40 SA time; 19.40 GMT)
Referee: Jerome Garces
Assistant referees: Glen Jackson, Ben O'Keeffe
TMO: George Ayoub
The #Springboks backline to face @unionargentina in Salta on Saturday. @CastleLagerSA @BlueTelecoms #LoveRugby pic.twitter.com/mG8zXxAw4O
— South African Rugby (@Springboks) August 24, 2016
The #Springboks forward pack to face @unionargentina in Salta on Saturday. @CastleLagerSA @BlueTelecoms #LoveRugby pic.twitter.com/3sVSqZdAlp
— South African Rugby (@Springboks) August 24, 2016
The #Springboks bench for weekend's @CastleLagerSA #RugbyChampionship clash v @unionargentina in Salta @BlueTelecoms pic.twitter.com/Nu0IxqDWai
— South African Rugby (@Springboks) August 24, 2016
