"Like Andy Todd he brings experience to the squad.
"I believe Andy has great years ahead of him. Every time I see him play he shows how consistent he is.
"We're very pleased to have him on board."
Stoke were also in the hunt for Griffin after the 28-year-old enjoyed a successful loan period at the Britannia Stadium last season, but ultimately the lure of top flight football proved too strong for the versatile defender's signature.