Glasgow Warriors captain Alastair Kellock has been ruled out for "several months" after undergoing shoulder surgery.
The Scotland lock was operated on by surgeon Umberto Fazzi at Ross Hall Hospital in Glasgow following his team's RaboDirect Pro12 final defeat to Leinster.
But he is now a doubt for the start of next season after opting to have what was a long-standing injury fixed.
The 32-year-old was left out of Vern Cotter's first Scotland squads for matches against Canada, United States, Argentina and South Africa.
Glasgow also revealed a number of other players are currently being assessed by their medical team following Saturday's 34-12 defeat in Dublin.
A spokesman added: "Glasgow Warriors would like to thank the Leinster team doctor Professor John Ryan and all the staff in the A&E department of St. Vincent's Hospital in Dublin for all their help following the game."