Anderson announced Thursday that he is retiring from the NFL, Adam Schefter of ESPN reports.

Anderson signed a one-year contract extension with the Bills on Monday, Chris Brown of the team's official site reports.

Anderson is once again inactive Sunday against Detroit, despite having cleared concussion protocol.

Anderson remains in the NFL's concussion protocol and will be limited at practice Wednesday, Matthew Fairburn of The Athletic reports.

Anderson (concussion) practiced on a limited basis for the third straight day Friday but has been ruled out for Sunday's game against the Jets.

Anderson (concussion) is still listed as a limited participant for Thursday's practice, Chris Brown of the Bills' official site reports.

Anderson (concussion) remains limited in practice.

Anderson (concussion) is still in the NFL's concussion protocol Monday, Matthew Fairburn of The Athletic reports.

Anderson (concussion) has been ruled out for Sunday's contest against the Jaguars.

Anderson (concussion) was spotted with a helmet at Tuesday's practice, Mike Rodak of ESPN.com reports. The quarterback still remains in the NFL's concussion protocol, however, Mike Rodak of ESPN.com reports.