Injury ends Dunbar's season
A scan at revealed that the 26-year-old sustained a bone injury in the 13th minute of the club's final regular Pro12 match against Connacht in Galway.
The Scotland international will not require surgery and will now begin a period of rest and recovery with his club's medical team.
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Glasgow Warriors coach Gregor Townsend said: "We're disappointed for Alex that his season has been cut short through injury.
"He had been playing very well and played a big role in getting us into the Pro12 play-offs.
"We wish him all the best with his rehab and we look forward to him returning to training ahead of the new season."