Declan Kidney has more injury concerns ahead of Ireland's tour of New Zealand and Australia as flanker Kevin McLaughlin pulled out of the squad this weekend.
The Leinster forward took a blow to the knee in the Magners League Grand Final against the Osprey's on Saturday.
McLaughlin joins Paul O'Connell and hooker Rory Best on a growing injury list.
Lions captain O'Connell has a groin problem while Ulster's Best has an ankle injury.
Kidney is preparing his squad to face the Barbarians on Friday, but are already without a number of long-term absentees.
Stephen Ferris, Denis Leamy and Luke Fitzgerald are all unavailable for the trip down under.
However, the Irish were given some better news as Niall Ronan joined up with the squad and could earn his third cap.
Leinster's Shane Jennings was also an injury concern but scans have shown that an ankle injury may not be as bad as first thought and he should be available for selection.
Ireland are due to face the All Blacks on June 12 before they play the New Zealand Maroi and the Australian national side in Brisbane.