Heading into the 2019 off-season, the Buffalo Bills have 17 pending free agents and five of those were starters on either offense or defense. The list consists of players who are Unrestricted Free Agents (UFA), Restricted Free Agents (RFA), and Exclusive Rights Free Agents (ERFA).
UFAs:
Alexander, Groy, Mills, and Miller were all starter for the Bills for the majority of the season. Alexander is the most vital of all the Bills free agents to bring back for 2019 while the others aren't sure what their future looks like with the team.