Bills head coach Sean McDermott said Wednesday that Spector (calf) is being designated for return from IR, Maddy Glab of the team's official site reports.
Spector has missed a requisite four games while on IR, and his 21-day practice window now kicks off. The second-year pro can be added to the 53-man roster at any point within his practice window, making him a candidate to return as early as Sunday on the road against Detroit.