Leinster have decided not to register either Cian Healy or Sean O'Brien for this weekend's Champions Cup trip to Wasps.
Both players have stepped up their return from long-term injury lay-offs this week by returning to full training.
But head coach Matt O'Connor has decided not to jeopardise their recovery by rushing them back to action.
Rhys Ruddock and Zane Kirchner will also miss this weekend's game in Coventry, but Ben Te'o is back in contention.
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