Rhys Ruddock looks set to miss Ireland's Six Nations match against Italy in Rome on Sunday.
The 28-year-old back-row forward captained the Irish team that beat the Azzurri 54-7 in the Autumn International at Soldier Field in Chicago in November.
Leinster have revealed Ruddock suffered a hamstring strain in training last week and is entering a period of rehabilitation.
The province have also revealed that Dan Leavy and Dave Kearney are unavailable for selection this week.
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Leavy is continuing to rehabilitate his calf issue, while Kearney is following return-to-play protocols following a head injury.
