Buffalo Bills coach Chan Gailey says running back Fred Jackson has been diagnosed with a concussion and has been ruled out from playing against Miami on Thursday.

Buffalo Bills coach Chan Gailey announced on his weekly radio show that running back Fred Jackson is being tested for concussion-like symptoms, adding it's too early to determine whether he'll play against Miami on Thursday.
Bills running back Fred Jackson is out with a concussion, and there's at least one teammate who's unhappy with how Patriots linebacker Brandon Spikes celebrated after delivering the blow.
Buffalo Bills coach Chan Gailey's job is secure, though quarterback Ryan Fitzpatrick should expect to face a challenge for the starting job next season.
Ballot and comments from AP Pro 32 panel voter Bob Glauber of Newsday.
The surgery Mario Williams had to fix his sprained left wrist appears to have also done plenty in repairing the Buffalo Bills' high-priced defensive end's self-confidence.
A person with direct knowledge of Mario Williams' plans says the defensive end has rejoined the Buffalo Bills and expects to play at Houston this weekend following a "procedure" on his sprained left wrist.

The surgery Mario Williams had to fix his sprained left wrist appears to have also done plenty in repairing the Buffalo Bills' high-priced defensive end's self-confidence.
Star defensive end Mario Williams had surgery on his left wrist and expects to play Sunday when the Buffalo Bills face the Houston Texans.