Bulls change four for Stormers
Marais named wing Travis Ismaiel, flyhalf Francois Brummer, scrumhalf Piet van Zyl and No.8 Arno Botha in the team, with Grant Hattingh fit again and included on the bench.
Hattingh last played for the team in the Super Rugby competition in April, but has recovered from the injury that kept him on the sidelines.
Ismaiel and Botha did not play against the Waratahs last weekend in Sydney and replaces Bjorn Basson and Hanro Liebenberg respectively.
Brummer and Van Zyl started on the bench in Sydney and swop places with Tian Schoeman and Rudy Paige.
Bulls: 15 SP Marais, 14 Jamba Ulengo, 13 Jesse Kriel, 12 Jan Serfontein, 11 Travis Ismaiel, 10 Francois Brummer, 9 Piet van Zyl, 8 Arno Botha, 7 Jannes Kirsten, 6 Pieter Labuschagne , 5 Rudolph Snyman, 4 Jason Jenkins, 3 Marcel van der Merwe, 2 Adriaan Strauss (captain), 1 Lizo Gqoboka.
Replacements: 16 Jaco Visagie, 17 Trevor Nyakane, 18 Pierre Schoeman, 19 Grant Hattingh, 20 Deon Stegmann, 21 Rudy Paige, 22 Tian Schoeman, 23 Dries Swanepoel.
Date: Saturday, May 21
Venue: Loftus Versfeld, Pretoria
Kick-off: 19.20 (17.20 GMT)
Referee: Ben O'Keeffe
Assistant referees: Glen Jackson, AJ Jacobs
TMO: Johan Greeff