Glasgow previously revealed that the centre would be moving on at the end of last season, following 119 caps in a decade-long career at Scotstoun.
The 28-year-old, who enjoyed a spell on loan at Newcastle Falcons at the end of the season, was a fixture in the Warriors midfield during his time at the club, with his brand of hard-running rugby making him a threat to defences throughout the league.
Capped 31 times by his country and with seven test tries to his name, the 6 foot 3 star played in Scotland’s November tests against Wales, Fiji and Argentina.
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