Ulster have named an unchanged team because of the European Champions Cup game against Scarlets on Friday in Belfast.
Flanker Sean Reidy has cleared the yield to play protocols to retain his place in the side which won at Llanelli a week.
Scarlets have made three employees changes to the team that suffered a consecutive European loss.
It is the third meeting between their game up of this season and the two sides over the past one month.
Wales lock Jake Ball yields for Scarlets so Lewis Rawlins switches to the later suffering a headache in the defeat against Glasgow two weeks ago.
Prop Rob Evans and middle Keiron Fonotia have been ruled out with Wales duo Hadleigh Parkes and Wyn Jones both starting.
Fullback Leigh Halfpenny is still missing with a head injury suffered while playing against Australia on 10 November while Blade Thomson, Josh Macleod and Aaron Shingler remain on the sidelines.
Ulster head trainer Dan McFarland has kept the identical squad he found in round three with number eight Nick Timoney after he impressed at Parc y Scarlets held to the seat.
Second row Ian Nagle is nursing a rib injury and also the loan registering from Leinster will not be risked for Friday’s fixture.
“It’s always dangerous when a team have nothing to lose, particularly this kind of good attacking outfit such as Scarlets,” explained Ulster scrumhalf John Cooney.
“We know they are going to throw across the ball and also try and play thus that it’s essential we adhere to our structures and play our own game”
“We don’t really want to get ahead of ourselves as it doesn’t really count for much if we turn out this weekend and also we don’t play well. We have to play to our brand and our ethos, such as we did last weekend, and hopefully again this week it’s that enjoyable, running rugby.”
Scarlets, that are 12 points adrift of all Pool Four leaders Racing 9-2, have not won a game in Belfast and appear unlikely to replicate last season’s success of reaching the Champions Cup semi finals.
“It’s been a frustrating campaign. We were virtually in the exact same situation as last season but credit to Ulster past weekend they were rather fine,” said head coach Wayne Pivac.
“Regrettably we’ve had a lot of mishaps, which has not helped the circumstance, but all in all we had chances to gain those games and didn’t take them.
“The reality could have been quite different. We have now been on the wrong end of gross margins and it has cost us this year”
After the defeat against Leinster last season, Scarlets’ve lost three European games that this campaign against Ulster, Leicester and Racing 9-2.
Ulster: L Ludik; H Speight, W Addison, S McCloskey, J Stockdale; B Burns, J Cooney; E O’Sullivan, R Best (capt), M Moore, ” Henderson, K Treadwell, S Reidy, J Murphy, M Coetzee.
Scarlets: J McNicholl; T Prydie, J Davies, H Parkes, S Evans; Ep Patchell, G Davies; W Jones, K Owens (capt), S Lee, J Ball, D Bulbring, L Rawlins, W Boyde, U Cassiem.
Replacements: Ep Elias, P Price, W Kruger, T Price, J helps, S Hidalgo-Clyne, D Jones, PAsquith.
Referee: Luke Pearce (RFU)
Assistants: JP Doyle and Karl Dickson (RFU)
T Mo: Graham Hughes (RFU)