Les Kiss makes just the solitary change to his Ulster side for Saturday's tricky trip to play the Ospreys in Swansea.
Only Craig Gilroy, who was a late withdrawal last weekend, comes into the starting line-up which thrashed Leinster 30-6 at Ravenhill.
Ulster currently sit in fourth in the Pro 12 table, a point ahead of Scarlets, and need a bonus point victory to guarantee their place in the play-offs.
The Scarlets travel to play Munster at Thomond Park, and if Ulster win without a bonus point will need a bonus point win of their own to leapfrog Kiss’s side.
Rory Best will captain the side for the vital encounter, while last week's man of the match Ruan Pienaar continues at halfback alongside Paddy Jackson.
Ulster: J Payne, A Trimble, L Marshall, S McCloskey, C Gilroy, P Jackson, R Pienaar, C Black, R Best, R Lutton, P Browne, F van der Merwe, I Henderson, C Henry, S Reidy. Replacements: R Herring, K McCall, A Warwick, R Diack, R Wilson, P Marshall, S Olding, D Cave.
Scarlets: Dan Evans, Ben John, Owen Watkin, Josh Matavesi, Eli Walker, Dan Biggar, Rhys Webb, Nicky Smith, Scott Baldwin, Dmitri Arhip, Rynier Bernardo, Rory Thornton, Dan Lydiate, Sam Underhill, James King. Replacements: Scott Otten, Gareth Thomas, Aaron Jarvis, Joe Bearman, Olly Cracknell, Brendon Leonard, Sam Davies, Tom Grabham
