Brian McLaughlin has named Paul Marshall and Pedrie Wannenburg in the Ulster starting line-up for the RaboDirect PRO12 clash with the Ospreys at Ravenhill on Friday, kick-off 7.05pm.
Marshall is included at scrum-half, with versatile South African Ruan Pienaar moving to out-half and Ian Humphreys dropping to the bench.
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 number eight 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.
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 team to play Ospreys at Ravenhill on Friday at 7.05pm:
Backs: S Terblanche; C Gilroy, N Spence, P Wallace, I Whitten; R Pienaar, P Marshall
Forwards: 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