Cape Town - Keegan Daniel has been included in the Springboks' starting line-up at No 8 to face Argentina at Newlands in Cape Town on Saturday.
The Test opens the new Rugby Championship series, and will also mark the 50th Test appearance for centre Francois Steyn.
Daniel's inclusion was one of five changes to the Bok side which last played against England at the end of June.
Daniel comes in for the injured Pierre Spies, and coach Heyneke Meyer said the young player would provide the team with "that X-factor".
"Pierre is one of the senior players and when you lose an experienced player like him it's a big setback," Meyer said at the team announcement here on Wednesday.
"But I'm glad for Keegan because it's a big opportunity for him and I'd like to see him taking it with both hands.
"It is a step up for Keegan, but he has really been playing well. I am really looking forward to seeing what he can do at this level. He’s got an X-factor about him.
"It will be a hard, physical game on Saturday and we are looking to Keegan to bring that (X-factor) that can make a difference.
"He’s got to run from the back, as the No 8 covers from the back, so it's going to be a big challenge. He was good against a physical team like the Chiefs and also against the top defensive team, the Stormers."
Spies's absence brings to six the number Bok loose forwards on the injury list, and Meyer said he had to carefully ponder the selection options for Saturday's showdown.
"I did consider moving Willem Alberts to No 8 so that Jacques Potgieter could come in on the blindside flank. Such a move would have given us more ball carriers.
"But Marcell Coetzee is not a specialist openside flanker and he carries the ball a lot, so I think we are covered when it comes to big ball carriers."
Meyer also had to make a brave call at lock. That resulted in dropping the capable Juandré Kruger, who ran the Bok lineouts against England. Andries Bekker will take over that role on Saturday.
"I had a difficult decision at lock and dropping Juandré wasn't easy," said Meyer.
"He is a good player and he did not let us down against England, so he is a bit unlucky. However, Andries is an extremely talented player and this game is at his home ground - Newlands - so that swayed it.
"I went with Flip van der Merwe as the cover on the bench because he's been outstanding when he's come [on] as a replacement in the Bulls' matches. Also if something happened to Andries, Flip is very capable of making the lineout calls.
"There has always been a question-mark over (the fitness of) Eben (Etzebeth) and I would have opted for a 5-2 split on the bench, but with JP (Pietersen) out I could not do so."
Two of the reserves, prop Pat Cilliers and Bulls three-quarter JJ Engelbrecht, are the new caps in the squad. Meyer said he kept an eye on their progress and felt the time was right to blood them at international level.
"It has been a while in coming, but they have both earned their places with good performances," said Meyer.
"Pat hasn't been playing a lot of rugby, but I am looking forward to seeing what he can do against a great pack like the Pumas have.
"We can never have enough experience and players can only gain experience by playing."Teams:
15. Zane Kirchner, 14. Bryan Habana, 13. Jean de Villiers (captain), 12. Frans Steyn, 11. Lwazi Mvovo, 10. Morné Steyn, 9. Francois Hougaard, 8. Keegan Daniel, 7. Willem Alberts (The Sharks, 6. Marcell Coetzee, 5. Andries Bekker, 4. Eben Etzebeth, 3. Jannie du Plessis, 2. Bismarck du Plessis, 1. Tendai Mtawarira
Substitutes: 16. Adriaan Strauss, 17. Pat Cilliers, 18. Flip van der Merwe, 19. Jacques Potgieter, 20. Ruan Pienaar, 21. Pat Lambie, 22. JJ Engelbrecht
15 Lucas Gonzalez Amorosino, 14 Gonzalo Camacho, 13 Marcelo Bosch, 12 Santiago Fernandez, 11 Horacio Agulla; 10 Juan Martin Hernandez, 9 Nicolas Vergallo, 8 Juan Martin Fernandez Lobbe (captain), 7 Alvaro Galindo, 6 Julio Farias Cabello, 5 Patricio Albacete, 4 Manuel Carizza, 3 Juan Figallo, 2 Eusebio Guinazu, 1 Rodrigo Roncero
Substitutes: 16 Bruno Postiglioni, 17 Marcos Ayerza, 18 Juan Pablo Orlandi, 19 Tomas Leonardi, 20 Leonardo Senatore, 21 Martin Landajo, 22 Martin Rodriguez