Pedrie Wannenburg has returned to the Ulster squad ahead of their must-win RaboDirect PRO12 game against Ospreys at Ravenhill on Friday (7.05pm).
The South African back row has recovered from a foot injury which has kept him out for over a month.
There is no place in Brian McLaughlin’s 30-man panel for injured captain Johann Muller and centre Darren Cave.
Ireland squad members Dan Tuohy, Paddy Wallace and Chris Henry look set to be available for Ulster despite the 6 Nations game with Italy on Saturday.
Ulster’s three-game winning run in the RaboDirect PRO12 ended at the Arms Park against Cardiff Blues on Friday.
But the Ulstermen will be happy to return to Ravenhill, where they have suffered just one defeat in their last 17 matches in all competitions.
Ospreys have won three of their last four encounters in the RaboDirect PRO12 and remain in second place in the table.
The Welshmen have won all six fixtures they have played against the Irish provinces so far this season and have won their last two games against Ulster.
Provisional Ulster Squad to play Ospreys, Friday, February 24, Ravenhill (kick off 7.05pm):
Callum Black, Adam Macklin, John Afoa, Jerry Cronin, Paddy McAllister, Andi Kyriacou, Nigel Brady, Lewis Stevenson, Dan Tuohy, Tim Barker, Neil McComb, Willie Faloon, Chris Henry (capt) Pedrie Wannenburg, Mike McComish, Robbie Diack
Paul Marshall, Ruan Pienaar, Ian Porter, Ian Humphreys, Luke Marshall, Paddy Wallace, Ian Whitten, Nevin Spence, Stefan Terblanche, Craig Gilroy, Conor Gaston, Chris Cochrane, Simon Danielli, Adam D’Arcy
Unavailable due to injury:
Declan Fitzpatrick, Jared Payne, Johann Muller, Darren Cave, Ali Birch