Glasgow Warriors have pulled off a coup by landing United States Sevens sensation Carlin Isles until at least May 2015, subject to a visa and medical.
The postponed Pro12 match between Newport Gwent Dragons and Edinburgh at Rodney Parade has been rearranged for Thursday, April 3.
Long-serving Edinburgh duo Ben Cairns and Steven Lawrie have been forced to retire from rugby due to long-term knee injuries.
James Downey helped himself to his first Munster try as the 2011 champions returned to the top of the PRO12 with a 25-11 victory over Ospreys at the Liberty Stadium.
Fullback Jordan Williams enhanced his burgeoning reputation as his two tries saw the Scarlets roar back to secure a 25-21 victory over Edinburgh in the Pro12.
Jack Conan marked his Leinster debut with a try-scoring man of the match performance as the reigning Pro12 champions saw off Cardiff Blues 34-22.
Cardiff Blues open the round on Thursday with their game against current champions Leinster at the Arms Park.
Anthony Foley will be promoted from forwards coach to the role of head coach at Munster - from July 1.
Newport Gwent Dragons prop Francisco Chaparro has been banned for 10 weeks for a tip tackle on Leinster scrumhalf Isaac Boss.