Nick Williams has signed a two-year extension to his contract at Ulster which keeps him at Ravenhill until 2016.
Returning Lions Tommy Bowe and Rory Best made the perfect return to Ulster colours as the hosts beat Treviso 32-13.
Sam Warburton will make his first appearance of the season for Cardiff against Leinster after recovering from injury.
Paddy Jackson starred for Ulster with 13 second-half points helping the visitors beat Irish rivals Connacht 18-7.
Geoff Cross and Aleki Lutui will start their first Edinburgh match of the season against Ospreys at the Liberty Stadium.
James Eddie scored a converted try with the last move of the game as Glasgow sealed a rare 13-12 victory over Ulster.
Round two of RaboDirect Pro12 begins with four Friday fixtures featuring Munster, Cardiff Blues, Ulster and the Dragons.
The Dragons picked up an impressive 15-8 victory over Ulster in their RaboDirect PRO12 opener at Rodney Parade.
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