Ulster coach Matt Williams will have captain Rory Best back in the squad for Saturday night’s home game against Glasgow Warriors, in the Magners League, 7.30pm.
Fellow Irish international Tom Court has also been released from international duties, though Stephen Ferris and Paddy Wallace have not been considered.
Back from a "Man of the Match" winning performance with Scotland in the RBS 6 Nations is Simon Daneilli.
Robbie Diack is out through injury.
“The players all know that they have to stand-up and perform come Saturday,” he said.
Ulster squad: (Forwards) Justin Fitzpatrick, Nigel Brady, Tom Court, Brendon Botha, Bryan Young, Ed O'Donoghue, Matt McCullough, Kieron Dawson, Carlo Del Fava, Chris Henry, David Pollock, Rory Best, Ryan Caldwell
(Backs) Simon Daneilli, Darren Cave, Andrew Trimble, Cillian Willis, Niall O'Connor, Clinton Schifcofske, Ian Whitten, Isaac Boss, Thomas Anderson, Ian Humphreys, Mark McCrea, Bryn Cunningham, Timoci Nagusa