Scotland wing Sean Maitland has been ruled out of the rest of the Pro12 season and his participation in the World Cup is in doubt.
The New Zealand-born wing underwent surgery to fix a shoulder problem that prevented him from playing in the Six Nations.
Warriors had hoped that the 26-year-old would be able to return in time for the latter part of their campaign, but Head Coach Gregor Townsend has confirmed that he will miss the rest of the season.
The news means that the British and Irish Lions flyer has played his last game for Glasgow before joining London Irish next season.
"Sean Maitland, who has worked really hard during his rehab, got some tough news last week when it became clear that his shoulder would require surgery," said Townsend.
"The operation at Spire Murrayfield Hospital was a success and he's targeting to be back for the Rugby World Cup.
"I'd like to take this opportunity to thank Sean for his contribution to the club.
"He's been an excellent player for us and we wish him well at the Rugby World Cup and also next season at London Irish."
Maitland, who can also play full-back, has 16 caps for Scotland, made 40 appearances Glasgow and scored ten tries since joining from the Crusaders in 2012.