Leinster head coach Leo Cullen has issued a squad injury update as the team continues preparations for a return against Munster at Aviva Stadium on 22 August.
Cullen has confirmed that winger Adam Byrne and second-rower James Ryan will both be out of action for several weeks.
Ireland lock Ryan suffered a shoulder injury in training before the recent break and had a procedure to address the issue. He is set to be sidelined for up to 10-12 weeks
The injury will see Ryan in a race against time to be fit Ireland's Six Nations matches in October.
Meanwhile, winger Byrne suffered a hamstring injury and is due to have a procedure this week. He will be out of action for up to 12 weeks.
Peter Dooley is rehabilitating a shoulder injury and will aim to return to training in the next two weeks while prop Vakh Abdaladze suffered a recurrence of his back injury and is seeking further opinion before a course of rehabilitation is decided upon.
The update also included some good news for Leinster with James Lowe returning to training last week having followed all government health advice and guidelines upon his arrival back into the country from New Zealand while the long-awaited return of Dan Leavy is drawing nearer with the flanker continuing to integrate gradually into rugby training after a significant multi-ligament knee injury.