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Ulster have made nine changes from last weekend's 35-22 defeat by the Lions for Saturday's United Rugby Championship game against the Bulls in Pretoria.
Iain Henderson returns to the starting line-up to captain the Irish province as the pack shows six changes in personnel from a week ago.
James McCormick and Corrie Barrett, who scored a try after coming off the bench last weekend, take over from John Andrew and Tom O'Toole in the front row.
Henderson and Charlie Irwin replace Kieran Treadwell and last weekend's skipper Alan O'Connor in the lock positions with James McNabney and David McCann taking over from Matty Rea and Nick Timoney in the back row.
Behind the scrum, Mike Lowry comes in for Ethan McIlroy at full-back with Ben Carson named at centre in place of Stuart McCloskey and Nathan Doak taking over from John Cooney at scrum-half.
McCormick, Carson and academy lock Irvine will be making their first Ulster starts with hooker Tadgh McElroy and development fly-half, James Humphreys also in line to make their debut for the Irish province after being named in the replacements.
O'Toole, O'Connor and Timoney drop to a replacements bench that also includes Dave Shanahan as Cooney is not named in the matchday squad.
Henderson started in Ulster's opening home win over defending champions Glasgow and came on a 51st-minute replacement for Treadwell last weekend as Ulster secured a four-try losing bonus point.
The Bulls have only played one game so far which was last weekend's 22-16 home win over Edinburgh.
Ulster: Mike Lowry; Werner Kok, Stewart Moore, Ben Carson, Jacob Stockdale; Aidan Morgan, Nathan Doak; Andrew Warwick, James McCormick, Corrie Barrett; Iain Henderson(capt), Charlie Irwin; James McNabney, Sean Reffell, David McCann.
Replacements: Tadhg McElroy, Eric O’Sullivan, Tom O'Toole, Alan O'Connor, Nick Timoney, Dave Shanahan, James Humphreys, Ben Moxham.