The 19-year-old striker has made 11 first team appearances for Palace since making his debut at the end of the 2005/6 season, but has a number of established strikers ahead of him in the pecking order at Selhurst.
The Eagles' signing of Besian Idrizaj on loan will have made his chances of regular first team football even more remote, so Grabban will be hoping he can make an impact north of the border to put himself back in Peter Taylor's plans.