With props, BJ Botha, Declan Fitzpatrick and Adam Macklin all unavailable due to injury, Ulster have drafted in Instonians' prop Alan Whitten, brother of Ulster centre Ian, ahead of this weekend's match.
The Ulster starting XV and replacements will be named before 12 noon tomorrow.
Tickets for the match are still available and gates open at 5.30pm for the 7.05pm kick off
ULSTER SQUAD
Forwards: Tom Court, Paddy McAllister, Bryan Young, Nigel Brady, Rory Best, Andi Kyriacou, Tim Barker, Johann Muller, Ryan Caldwell, Dan Tuohy, Willie Faloon, Chris Henry, Robbie Diack, TJ Anderson, Pedrie Wannenburg
Backs: Adam D'Arcy. David McIlwaine, Jamie Smith, Simon Danielli, Andrew Trimble, Paul Emerick, Darren Cave, Ian Whitten, Paddy Wallace, Ian Humphreys, Niall O'Connor, Paul Marshall, Ian Porter, Ruan Pienaar
Unavailable due to injury: BJ Botha, Stephen Ferris, Declan Fitzpatrick, Adam Macklin, Bryn Cunningham, David Pollock
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