A knee injury has forced the former Scotland 'A' player out of the game at the age of 32.
Calvin started his career in Scotland with Boroughmuir and turned pro with Edinburgh. He moved west to joining Glasgow and enjoyed four years in the city before moving to Viadana in Italy.
Always a popular figure in Glasgow, Calvin and Viadana faced the Warriors in last season's Heineken Cup.
glasgowwarriors.com would like to wish Calvin and family every success for the future.











