Bell was elevated to the Dolphins' active roster from their practice squad Monday, Alain Poupart of SI.com reports.
Bell was activated to the Falcons' practice squad from the COVID-19 list Tuesday.
Bell was placed on the Falcons' practice squad reserve/COVID-19 list Monday.
Bell was waived by the Buccaneers on Monday, Greg Auman of The Athletic reports.
Bell (undisclosed) was able to suit up for Tuesday's practice, Paul Gutierrez of ESPN.com reports.
Head coach Jon Gruden said Tuesday that Bell's undisclosed injury is "not as serious as we feared" and that he should return sometime between a week and 10 days, Michael Gehlken of the Las Vegas Review-Journal reports.
The Raiders selected Bell in the seventh round of the 2019 NFL Draft, 230th overall.