Luke Fitzgerald will miss out on Leinster's hosting of leaders The Ospreys in the Guinness PRO12 League at The RDS on Saturday.
The troublesome groin that required surgery during the summer tightened up in the warm-up session before the Treviso match on Sunday.
The club has taken a decision to delay his involvement with one eye on the Champions Cup back-to-back matches against Harlequins.
Hooker Richardt Strauss may also miss out against The Ospreys due to a tight hamstring with a view to getting him back for Europe.
Kevin McLaughlin is undergoing the appropriate return-to-play procedures following his removal from a blow to the head in Treviso.