Kruger has recovered from an ankle injury after several weeks on the sidelines, while Potgieter (hamstring) and Greyling (leg) was also declared fit along Rudy Paige (knee) and Burger Odendaal (ankle).
With Piet van Zyl out, Andre Warner will tour as third scrumhalf, the Vodacom Blue Bulls and UP-Tuks’ first participation in the squad. Travis Ismaiel will also tour as the extra outside back.
They then face the Brumbies in Canberra on May 29 and the Rebels in Melbourne on June 6th, before returning home.
The squad is: Jesse Kriel, Bjorn Basson, JJ Engelbrecht, Travis Ismaiel, Jan Serfontein, Burger Odendaal, Handré Pollard, Jacques-Louis Potgieter, Rudy Paige, Francois Hougaard, Andre Warner, Arno Botha, Jacques du Plessis, Pierre Spies, Deon Stegmann, Lappies Labuschagne, Victor Matfield, Grant Hattingh, Flip van der Merwe, Werner Kruger, Marcel van der Merwe, Trevor Nyakane, Dean Greyling, Morné Mellett, Adriaan Strauss, Callie Visagie, Jaco Visagie.