The revolving door the winless Miami Dolphins have had at quarterback this season took another turn Tuesday when Sage Rosenfels decided he wasn't healthy enough to continue playing.
Rosenfels was placed on the team's reserve non-football illness list, and the Dolphins signed former Buffalo Bills first-round pick and starter J.P. Losman, a seven-year veteran who has also played for the Seahawks and Raiders.
A blood disorder sent Rosenfels to the hospital twice in August, and though he felt better recently, eventually returning to the NFL with the Dolphins, he acknowledged in a statement he hasn't fully recovered.
Losman started 33 games in his five seasons with Buffalo, throwing 33 touchdowns and 24 interceptions. Losman, who has an NFL career quarterback rating of 75.6, will backup starter Matt Moore.
Around the league
* The Washington Redskins placed tight end Chris Cooley (broken finger) and running back Tim Hightower (torn ACL) on injured reserve.
* The Colts placed quarterback Kerry Collins (concussion) on injured reserve, a move that will end the 17-year veteran's season and possibly his career.