This is likely to rule him out of Ireland's 2012 RBS 6 Nations campaign, as well as most if not all of Leinster's Heineken Cup title defence.
Joe Schmidt's men face a challenging trip to Stade de la Mosson to take on Montpellier this coming Saturday, with the management reporting no fresh injury concerns following the league derby win over Munster.
Aside from other long term absentees Mat Berquist and Shane Horgan, the remainder of the squad trained in UCD on Monday afternoon as the province geared up for the first competitive meeting of the two sides.
There were milestones for Ireland forwards Devin Toner (75 appearances) and Mike Ross (50 appearances) last time out in a game which also marked seasonal Leinster debuts for a further six players - Gordon D'Arcy, Cian Healy, Jamie Heaslip, Shane Jennings, Sean O'Brien and Eoin Reddan.
D'Arcy lies in joint sixth place in the Heineken Cup's all-time try-scoring list (23 tries in 77 European appearances) since making his tournament debut back in the 1998/99 campaign.
Jonathan Sexton continued his fine run of recent form with a 100% kicking return whilst scoring 21 points against Munster, boosting his points tally to 44 in two games to date, with Rob Kearney also chipping in with his first drop goal in Leinster colours.
The team for the Pool 3 clash with Heineken Cup newcomers Montpellier will be announced on Friday afternoon prior to the squad's departure for the south of France.