Roger Wilson will make his 150th appearance for the Province in the game and starts at blindside flanker.
The match will also see a first start for centre Stuart McCloskey who came on as a substitute in the win over Newport Gwent Dragons a fortnight ago.
Jared Payne starts the game at full back, with Tommy Bowe, who scored two tries on his return against Dragons, named on the right wing and Ireland Under 20s player, Rory Scholes, continuing on the left wing.
Man of the match from the Dragons game, Darren Cave, is selected alongside 21 year-old McCloskey.
Ruan Pienaar is selected a t scrum-half, with Paddy Jackson, who has been released from international duty, named at outhalf.
In the pack, John Afoa returns to the starting XV where he joins Callum Black and Rob Herring in the front row.
Johann Muller starts in the second row and is partnered by Robbie Diack who starts at 5.
Sean Doyle starts at openside, with Wilson at blindside and Nick Williams named at Number 8.
Ferris is joined on the bench by forwards Niall Annett, Tom Court, Ricky Lutton and Lewis Stevenson, with Michael Heaney, Craig Gilroy and Ricky Andrew completing the match-day squad.
Ulster XV and replacements to face Scarlets, RaboDirect PRO12, Ravenhill, Friday (kick off 19:05) (15-9): J Payne, T Bowe, D Cave, S McCloskey, R Scholes, P Jackson, R Pienaar; (1-8): C Black, R Herring, J Afoa, J Muller (Captain), R Diack, R Wilson, S Doyle, N Williams; Replacements (16-23): N Annett, T Court, R Lutton, L Stevenson, S Ferris, M Heaney, C Gilroy, R An drew.
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