Ireland internationals Rory Best and Stephen Ferris are included in Ulster's squad for Thursday's friendly against Leeds at Ravenhill.
Rugby League convert Adam D'Arcy is currently on trial with Ulster from the Manly Rugby League team in Australia. D'Arcy, 23, plays at full-back.
"We have one full contract left to fill for the 2010-11 season and we're looking at Adam as a potential player for that place," said Operations Director David Humphreys.
"Should he get some game time on Thursday it will be a huge opportunity for him to show us what he can potentially do for Ulster."
ULSTER SQUAD (v Leeds):
Forwards: Bryan Young; Rory Best; Declan Fitzpatrick; Nigel Brady; Paddy McAllister, Adam Macklin, Johann Muller, Tim Barker, Ryan Caldwell, Stephen Ferris, Willie Faloon, Pedrie Wannenburg, Robbie Diack, TJ Anderson;
Backs: Ian Porter, Michael Heaney, Niall O'Connor, Ian Humphreys, Jonny Shiels, Darren Cave, Ian Whitten, Craig Gilroy, Tommy Seymour, David McIlwaine, Adam D'Arcy.