Leinster flanker Rhys Ruddock could miss the rest of the season after undergoing surgery on an arm injury.
Watch all the highlights from this weekend's Guinness PRO12 action as the race for the play-offs heats up.
Munster scored five tries in the final 25 minutes of their 42-20 victory over Connacht at Thomond Park on Saturday.
Ospreys have moved into fourth place in the Guinness PRO12 with a 53-22 win over Zebre on Saturday night.
Newport Gwent Dragons were made to work for their 32-17 Guinness PRO12 away win over Benetton Treviso on Saturday night.
Edinburgh boosted their hopes of a top-six finish in the Guinness PRO12 with a 26-15 victory away to 14-man Scarlets.
Leinster and Glasgow Warriors earned three points apiece at the end of an enthralling 34-34 Guinness PRO12 draw.
Ulster ran riot as they scored four tries to beat Cardiff Blues 36-17 in the Guinness PRO12 on Friday night.
Former Wales back-row Gareth Delve has signed a two-year deal with the Ospreys after a spell in Japan.
Wales and Lions prop Adam Jones will join Aviva Premiership club Harlequins at the end of the season.
The Exeter Chiefs have continued their recruitment drive with the signing of lock Ollie Atkins from Edinburgh on a two-year deal.
Scarlets have boosted their front-row options for next season with the signing of tighthead prop Will Taylor from Wasps.
Winger Tom Grabham has signed a new two-year deal with the Ospreys.
Cardiff Blues have signed American international back Blaine Scully from Leicester on a long-term deal.
Wales prop Rob Evans has extended his contract at Scarlets, three days after making his first international start.
Edinburgh have signed No 8 Nasi Manu from Super XV outfit Highlanders.
Glasgow Warriors have signed Scotland international lock Kieran Low from London Irish.
Rhys Webb has become the eighth Wales international to sign a dual contract.
Grayson Hart has agreed to leave Edinburgh for Pro12 rivals Glasgow this summer.
Munster front row trio BJ Botha, Niall Scannell and Kevin O'Byrne have all signed contract extensions with the province.
The Hurricanes, Toulouse and Chris Henry all feature in Rupert Cox's weekly round-up blog.