Leinster have confirmed that Rhys Ruddock will miss next Saturday's Champions Cup quarter-final against Bath at Aviva Stadium.
Ruddock suffered a broken arm against Harlequins last December, but made a return to action in the Pro12 clashes with Ospreys in February and Scarlets in early March.
However, Leinster revealed today that his arm requires surgery and that the back row and will be missing for the forseeable future.
Second row Kane Douglas is also a doubt for Saturday's clash with Bath. Douglas missed last Friday's draw with Glasgow with a hamstring injury and will be monitored during the week.
Eoin Reddan took a bang to the head in the same tie and will follow the return to play protocol.