Stephen Ferris, the fourth Ulsterman in the Irish squad for last Saturday's win over Wales, has been ruled out of this weekend's league game due to a dislocated finger.
But Ulster have been boosted by the return to the squad of Scotland winger Simon Danielli and Italian lock Carlo Del Fava after the RBS 6 Nations campaign.
Number 8 Robbie Diack is also back in the panel after recovering from fracturing his fifth metatarsal against Edinburgh, earlier in the season.
Along with Ferris, the following players were not considered for selection due to injury: Paul Steinmetz, Bryn Cunningham and Rob Dewey.
ULSTER Squad (v Leinster): Backs (12) - Simon Danielli, Darren Cave, Andrew Trimble, Cillian Willis, Niall O'Connor, Clinton Schifcofske, Ian Whitten, Isaac Boss, Ian Humphreys, Mark McCrea, Timoci Nagusa, Paddy Wallace.
Forwards (13) - Justin Fitzpatrick, Nigel Brady, Tom Court, BJ Botha, Bryan Young, Ed O'Donoghue, Matt McCullough, Carlo Del Fava, Chris Henry, David Pollock, Rory Best, Ryan Caldwell, Robbie Diack.