Ireland scrum-half Isaac Boss has been ruled out of Saturday's RBS 6 Nations match against Scotland.
Boss will miss the Murrayfield encounter, which will see Ireland clinch the Triple Crown if they win, after suffering a shoulder injury during Ulster's Magners League defeat against Llanelli Scarlets.
He was ruled out after a scan in Belfast today and his injury will be reassessed next week when Ireland will be hoping to head for Italy with the championship within their grasp.
Boss, a try-scoring substitute in Ireland's 43-13 RBS 6 Nations demolition of England nine days ago, was cover for Peter Stringer.
Ireland coach Eddie O'Sullivan had already added Wasps scrum-half Eoin Reddan to his training squad as a potential replacement for Boss.
O'Sullivan is due to announce the starting line-up tomorrow.
Reddan is among ten players called up for training, joining Geordan Murphy, Tommy Bowe, Barry Murphy, Rob Kearney, Frankie Sheahan, Bryan Young, Stephen Ferris, Jamie Heaslip and Trevor Hogan.
