Graeme told The Scotsman: "It was a good offer at this stage of my career and Bristol came in. I've been really happy at Glasgow and I think the Magners League is a great level, but with a couple of years left of my career, this is a new challenge."
Graeme is just one of a number of Glasgow favourites who will leave the club at the end of the season, but his mind is 100% on the job in hand at the Warriors: "We'll only think about [leaving] at the end of this season because if I think about it now I'll not do myself justice in the games we have left and I can't even imagine that. I've had a great time at Glasgow and loved every minute and I want to finish on a high, which means putting in a performance this Sunday."