The Bills signed Ankou to the practice squad Monday.
Ankou was previously let go with an injury settlement by Buffalo in late August after sustaining a hamstring injury in the team's final preseason game. However, Sal Capaccio of WGR Sports Radio 550 Buffalo reports that the 28-year-old is healthy again and ready to play this season. Ankou will serve as a potential gameday elevation behind banged-up defensive tackles Ed Oliver (ankle) and Jordan Phillips (hamstring).