Richie told glasgowwarriors.org: “I’m extremely thankful for all the support from the Glasgow fans, coaches and my fellow players. I’ve had a great time over the last four years so I’ll be very sad to leave in the summer.”
Warriors head coach, Sean Lineen, added: “Richie leaves the Warriors with the best wishes of all players, management and supporters. He will be a great addition to Sale Sharks.
“Despite his departure, I believe we will continue to have a very strong and competitive back-row with the likes of John Barclay, Johnnie Beattie and Robert Harley already included in next season’s squad along with some impressive new talents like Ryan Wilson and Chris Fusaro.”