Rory is moving Down Under for a new career with the Manly club in Sydney, after playing his final game for Glasgow in the 34-31 win over the Ospreys.
Glasgow chief David Jordan said: "Rory was a valuable member of our squad but he didn't get many starts for us over the season.
"We believe he is taking positive steps by going to Australia to be exposed to high-intensity rugby.
"Of course, if he proves a success in that arena it could lead to something more solid when and if he returns."