Leinster have confirmed that Brian O'Driscoll will miss this weekend's Heineken Cup clash with Castres at the RDS.
Head coach Matt O'Connor has admitted that the veteran centre is still strugglinlg with a calf strain and says that it is still too soon to say when the 34-year-old will be able to return.
O'Connor says that O'Driscoll and Lote Tuquiri remain on the injury list along with the likes of Shane Jennings and Leo Cullen.
Prop Mike Ross is still hoping to be available for the visit of the French champions as he continues his recovery from a hamstring injury.
O'Driscoll has missed the defeat to Munster and the Heineken Cup opener against Ospreys.