Wales international Taulupe Faletau and Samoa scrum-half Kahn Fotuali'i are set to make their debut for their newly joined English Premiership club Bath on Saturday.
A hard-fought 31-15 win over Scarlets at Thomond Park helped Munster to earn a European Champions Cup spot for the next season after finishing sixth in the ongoing Pro12 tournament.
Two tries apiece for fly-half Finn Russell and wing Lee Jones ensured Glasgow extended their winning streak to eight Guinness Pro12 games with a seven-try, 46-10 hammering of Scarlets at Parc y Scarlets.
The Scarlets boosted their PRO12 play-off hopes by sealing a rare league double over Ulster with a 21-20 victory at the Kingspan Stadium on Sunday, and in doing so traded places with their hosts in the table.
Welsh region the Scarlets have been hit with a suspended fine after naming an ineligible player in their matchday squad for a European Champions Cup game.
Scarlets were grateful to a late penalty from replacement fly-half Aled Thomas as they snatched a 22-21 victory in a gripping Guinness Pro12 tussle at Parc y Scarlets.
Northampton boss Jim Mallinder praised a "good solid game" from England captain-in-waiting Dylan Hartley after Saints edged closer to the European Champions Cup quarter-finals.
A late penalty from Steven Shingler clinched a hard-fought 21-19 victory over Connacht at Parc y Scarlets to send the hosts back to the top of the Guinness Pro12.
The Ospreys claimed their 12th win in 15 games over the Scarlets, winning an entertaining Guinness PRO12 derby 27-26 in Llanelli – re-vitalising their play-off hopes.