Fergus McFadden has been ruled out of the restart of Leinster's Guinness Pro14 campaign
The 34-year-old wing, who will depart the club at the end of the season, picked up a calf injury in training and will miss the next six weeks, the province, who play Munster on Saturday night (live on RTÉ Radio) at the Aviva, said.
With the Heineken Champions Cup final scheduled for 17 October, Leinster will have to proceed in Europe for the former international to have a chance of appearing in blue again.
Versatile back Conor O’Brien, meanwhile, is out for a "number of months" following surgery for a hamstring issue.
The Pro14 holders also said prop Peter Dooley was expected to return to training this week after a shoulder injury, with Dan Leavy also continuing his progress and his gradual exposure to rugby training as he recovers from his knee injury.
Front row Vakh Abdaladze is due to have a procedure this week to address a back injury.