Scrum-half Chris Cusiter will miss Scotland's autumn internationals after suffering a dislocated shoulder.
Cusiter sustained the injury in Glasgow's 28-10 win over Ospreys and although it does not require surgery, he's expected to be out of action until around the middle of December.
That means the No.9 will not be available to feature when New Zealand, South Africa and Tonga visit Murrayfield to face Scotland later this year.
Warriors head coach Gregor Townsend said: "Everyone at Glasgow Warriors is disappointed that a quality player like Chris Cusiter is likely to be out of action until around the middle of December.
"It's encouraging, though, that he doesn't need surgery, and we know he's in the best possible hands with our medical team. Chris is a tough competitor, and he'll be working hard to return to fitness and make a significant contribution to our campaign.
"We wish him well with his rehab, and look forward to welcoming Niko Matawalu to the club to supplement our options in the scrum-half position."