Brian McLaughlin has named Paul Marshall and Pedrie Wannenburg in the starting line up for Ulster's RaboDirect PRO12 clash with the Ospreys at Ravenhill tomorrow (7.05pm).
Marshall is included at scrumhalf, with versatile South African Ruan Pienaar moving to outhalf and Ian Humphreys dropping to the bench.
Pienaar has played in the no 10 jersey for the previous club Natal Sharks, as well as for the Springboks.
The backline remains otherwise unchanged from the one that faced Cardiff last weekend.
Up front, Pedrie Wannenburg has returned from a foot injury and will pack down at No 8 in place of Robbie Diack.
Chris Henry will again captain the side from the blindside flank, with Willie Faloon remaining on the other side of the scrum.
Dan Tuohy and Lewis Stevenson continue the partnership at lock. There are two changes in the front row with Paddy McAllister coming in at loosehead prop for Callum Black and Andi Kyriacou replacing Nigel Brady at hooker.
Ulster (v Ospreys): S Terblanche; C Gilroy, N Spence, P Wallace, I Whitten; R Pienaar, P Marshall; P McAllister, A Kyriacou, J Afoa, L Stevenson, D Tuohy, C Henry (capt), W Faloon, P Wannenburg.
Replacements: N Brady, C Black, A Macklin, T Barker, R Diack, I Humphreys, S Danielli, A D'Arcy
Unavailable due to injury: Jared Payne (achilles), Declan Fitzpatrick (neck), Darren Cave (foot), Johann Muller (calf), Ali Birch (knee).