Dan Tuohy could feature against the Welsh side after he resumed training earlier this week. The second row suffereda torn calf muscle in the 9-10 loss to Northampton three weeks ago but has responded well to treatment.
Development hooker Niall Annett, who made a significant impact off the bench in Saturday's defeat to Munster, has also been included despite Rory Best returning to the squad.
Best is one of a number of internationals, including Andrew Trimble, Iain Henderson and Ruan Pienaar, who are available after missing the trip to Thomond Park.
Tickets for both forthcoming home games against Scarlets, and Glasgow on Friday 11th January are now very limited and only behind the goal posts are available. Please note this area is restricted viewing and not suitable for children.
Ulster extended squad v Scarlets, RaboDirect PRO12, Friday 4th January, Ravenhill (kick off 7.05pm):
Forwards (15)
Rob Herring, Rory Best, Niall Annett, Callum Black, Tom Court, John Afoa, Adam Macklin, Lewis Stevenson, Neil McComb, Dan Tuohy, IainHenderson, Robbie Diack, Chris Henry, Nick Williams, Roger Wilson.
Backs (11)
Paul Marshall, Michael Heaney, Ruan Pienaar, Paddy Jackson, Luke Marshall, Paddy Wallace, Darren Cave, Craig Gilroy, Andrew Trimble, Jared Payne, Adam D'Arcy
Guinness PRO12
Suite 208, Alexandra House,
The Sweepstakes
Ballsbridge, Dublin 4, Ireland