Ulster scrum half Ruan Pienaar and back row forwards Iain Henderson, Chris Henry and Roger Wilson have recovered from injury and are included in the extended squad to face Leinster at the RDS on Saturday evening (kick-off 6.15pm).
Ulster head coach Mark Anscombe can also call upon Ireland internationals Rory Best and Craig Gilroy, who return to the provincial set-up following the RBS 6 Nations.
Saturday’s game will see Ulster take on their province rivals Leinster who are new leaders of the RaboDirect PRO12.
Ulster are third in the table, level on points with second-placed Glasgow Warriors and a point behind table toppers Leinster.
ULSTER Squad (v Leinster) – Backs (10): Ruan Pienaar, Jared Payne, Craig Gilroy, Paul Marshall, Peter Nelson, Michael Heaney, Paddy Jackson, Stuart Olding, Darren Cave, Andrew Trimble.
Forwards (15): Neil McComb, Callum Black, Rory Best, Robbie Diack, Chris Henry, Dan Tuohy, Lewis Stevenson, Johann Muller, Nick Williams, Rob Herring, Kyle McCall, Ricky Lutton, Tom Court, Iain Henderson, Roger Wilson.