Bell, responding to a comment on Instagram about his time with the Chiefs in 2020, said, "I'd never play for Andy Reid again ... I'd retire first.''
Bell didn't specify his complaint with Reid, the Chiefs' coach.
Kansas City signed Bell last year after his release from the New York Jets, but he played sparingly. Bell played in nine games, starting two, and rushed for 254 yards and two touchdowns.
By the season's end, he wasn't much of a factor for the Chiefs. Despite the absence of injured starter Clyde Edwards-Helaire, Bell got the ball just twice in the Chiefs' divisional round win over the Cleveland Browns.
Bell is a free agent but has not signed with any team.