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.
Munster were knocked off the top of the table as they suffered a shock 29-19 defeat away at Benetton Treviso.
Leigh Halfpenny will make his first appearance for Cardiff this season while Munster look to make history in Italy.
Scrum-half Gareth Davies scored both Scarlets tries as the Welsh region recorded a 26-10 success over Treviso.
Week two of the Pro12 is rounded off on Saturday as Leinster host Ospreys before Treviso travel to face Scarlets.
Wales fly-half Dan Biggar kicked 14 points as the Ospreys ground out a 24-19 RaboDirect PRO12 victory over Treviso.
Exeter Chiefs will face the Heineken Cup champions for the second successive season after they were drawn with Toulon.
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