The 25-year-old was operated on by Miss Julie McBirnie, a shoulder specialist at Spire Murrayfield Hospital, and has now begun his rehabilitation under the care of the Warriors medical team.
Head coach Gregor Townsend told www.glasgowwarriors.org: “It’s clearly disappointing for Jon and the club as a whole that he will miss a substantial amount of rugby in the first part of the season.
“He will receive excellent care and attention from our medical team as he recovers from the injury, and we look forward to welcoming him back to the fray in due course.
“On behalf of everyone at the club, I’d like to wish Jon all the best with his rehabilitation. He’s a positive character, which will stand him in good stead for the challenges ahead.”