South Africa rugby head coach Heyneke Meyer has added two Bulls players to the Springbok squad to travel to Australia and New Zealand for the next two Tests in Rugby Championship.
The squad of 26 players who returned from Argentina on Monday was retained, with Zane Kirchner (fullback) and Chiliboy Ralepelle (hooker) the only additions.
Ralepelle, the third hooker in the squad, missed the Argentinean tour because of a back injury and will have to pass a fitness test before he can board the plane to Australia. A final call on his availability will be made by Friday.
The Springbok squad of 28 players will depart for Brisbane via Sydney on Saturday afternoon for their Tests against Australia in the Queensland capital on 7 September and New Zealand in Auckland on 14 September.
"This will be two tough weeks on the road against two of the best sides in the world and as we saw last weekend against Argentina, we still have a lot of hard work to do," said coach Heyneke Meyer.
"The Springboks have never beaten Australia at Suncorp Stadium in Brisbane and our last victory at Eden Park was in 1937.
"Australia may have lost their first two matches of Rugby, but they showed a marked improvement last weekend in Wellington.
"They are always a tough opponent at home - the Springboks' last victory over there was in 2009 and we've only won three out of 18 matches in this competition in Australia.
"We get together on Thursday and will have to put in a lot of hard work in the next 10 days. We let ourselves down in certain areas of the game in Mendoza and will have to fix those if we are going to be competitive against Australia."
The 28-man South Africa squad to Australia and New Zealand:
Lourens Adriaanse, Willem Alberts, Marcell Coetzee, Bismarck du Plessis, Jannie du Plessis, Eben Etzebeth, Siya Kolisi, Juandré Kruger, Francois Louw, Tendai Mtawarira, Coenie Oosthuizen, Chiliboy Ralepelle, Gurthrö Steenkamp, Adriaan Strauss, Flip van der Merwe, Duane Vermeulen.
Bjorn Basson, Jean de Villiers (captain), JJ Engelbrecht, Bryan Habana, Zane Kirchner, Patrick Lambie, Willie le Roux, Ruan Pienaar, Jan Serfontein, Morné Steyn, Piet van Zyl, Jano Vermaak.