Ulster have announced the signings of London Welsh players Peter Browne and Paul Rowley.
Dragons captain Rynard Landman could find himself in hot water after being sent off during the 30-25 defeat to Connacht.
Glasgow Warriors had to battle hard for their 19-16 victory over Ospreys at the Scotstoun Stadium.
Munster had to fight back from behind to earn a thrilling 25-25 draw with Scarlets in Llanelli in the PRO12 on Saturday.
Team news for Sunday's PRO12 meeting between Dragons and Connacht in Bridgend.
Sean Cronin's last-gasp try sealed a flattering 29-8 bonus-point victory for Leinster over bottom side Zebre at the RDS.
Stuart McCloskey was sent off as Ulster held on for a 20-17 victory against Edinburgh at Murrayfield.
Treviso had earned a bonus point before half-time as they consigned Cardiff Blues to a 40-24 PRO12 defeat.
Team news for Saturday's Guinness PRO12 fixture between Glasgow Warriors and Ospreys at Scotstoun.
Team news for Saturday's Guinness PRO12 fixture between Scarlets and Munster at Parc y Scarlets.
Team news for Friday's Guinness PRO12 fixture between Benetton Treviso and Cardiff Blues at the Stadio Monigo.
Team news for Friday's Guinness PRO12 fixture between Leinster and Zebre at the RDS.
Team news for Friday's Guinness PRO12 game between Edinburgh and Ulster at Murrayfield.
Ulster returned to winning ways in the Guinness PRO12 with a 43-3 bonus-point victory over Treviso, which lifted them to second in the table.
Team news for Sunday's Guinness PRO12 fixture between Zebre and Glasgow Warriors at the Stadio Sergio Lanfranchi.
Glasgow Warriors gained revenge for their PRO12 final heartache with a 22-20 victory over Leinster at Scotstoun.
Ulster produced a stirring comeback to earn a 32-32 draw with Scarlets in their PRO12 clash on Saturday.
Edinburgh recorded a rare win on Irish soil as they triumphed 14-13 over Munster at Thomond Park.
Ospreys opened their Guinness Pro12 campaign with a resounding bonus-point victory over Benetton Treviso on Friday.
Johnny Sexton is expected to return to old club Leinster from French Top 14 club Racing Metro when his contract expires