Buffalo did not immediately sign anyone to fill the vacated roster spots, leaving the club with 88 players, two short of the 90-player limit.
Roberson (6-4, 205) spent time on Buffalo and Carolina’s practice squads last season. The Bills placed him on their 53-player roster for the final game of the season. A Stephen F. Austin product, the 23-year-old Roberson signed with Cleveland after the 2013 draft.
Robinson (5-10, 175) signed with Buffalo as an undrafted free agent in May. Robinson, 22, played collegiately at Clemson.