Rhys Ruddock will call time on his rugby career at the end of this season.
The 33-year-old won 27 Ireland caps, while he also played 228 times for Leinster.
He made his debut for the province in 2009 and played for Ireland at two World Cups.
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Jason Jenkins will miss Leinster's meeting with Connacht in the URC on Friday.
He sustained a knee injury in Saturday's Investec Champions Cup final defeat to Toulouse.
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But Garry Ringrose will increase his training load this week as he recovers from a shoulder injury.
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Jimmy Duffy is to join Richie Murphy's coaching staff at Ulster.
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He previously assisted Murphy with the Irish Under 20s team.
Meanwhile, it's been confirmed that Will Addison will leave the province to re-join Sale Sharks.
