Ireland internationals Paddy Wallace and Tom Court will be part of Ulster's squad to play The Ospreys at Ravenhill in the Magner's League this Friday night (ko 7.05pm).
Coach Brian McLaughlin said: "I am delighted to welcome Tom and Paddy back from Irish duty and have no doubt that they will further bolster a squad that has already gelled impressively in our pre-season encounters.
"We've had three good warm-up games in August that have allowed the management to trial a wide range of players but it only starts counting from now and we are looking forward to testing ourselves in the tournament opener against last season's winners."
Forwards: Tom Court, Paddy McAllister, Bryan Young, Declan Fitzpatrick, Adam Macklin, Rory Best, Nigel Brady, Andy Kyriacou, Tim Barker, Johann Muller, Ryan Caldwell, Willie Faloon, TJ Anderson, Robbie Diack, Stephen Ferris, Pedrie Wannenburg
Backs: Adam Darcy, David McIlwaine, Nevin Spence, Mark McCrea, Tommy Seymour, Jonny Shiels, Darren Cave, Ian Whitten, Paddy Wallace, Ian Humphreys, Niall O'Connor