The Bulls overcame a second-half implosion to secure all five points in a 40-34 win over United Rugby Championship leaders Glasgow Warriors at Loftus Versfeld.
Ruan Vermaak has penned a new deal with the Bulls which will see the big lock remain at Loftus until June 2027.
A 27-man Stormers squad left Cape Town on Tuesday for a crucial two-match United Rugby Championship tour.
Fullback Warrick Gelant believes that the Stormers are set up to handle whatever is thrown at them on their upcoming two-match tour.
The Lions are in a race to make the top eight of the United Rugby Championship table.
Bulls director of rugby Jake White believes the way his team beat the Ospreys 61-24 at Loftus Versfeld highlights the variation in their game.