Gradkowski, who is an unrestricted free agent, dislocated a finger on his non-throwing hand during a pre-season game that required season-ending.
Gradkowski has played for five different teams in his career, and the signing of Michael Vick, as well as the emergence of Landry Jones as a viable back-up to the oft-injured Ben Roethlisberger, suggests Gradkowski could be backing-up a quarterback for a sixth NFL team in 2016.