The Lions placed CB Bill Bentley on injured reserve and signed veteran S Don Carey.
Bentley suffered a shoulder injury on Oct. 14 against the Eagles and the rookie has not played since. In his four games this season, he had three starts and made 15 tackles.
Carey has versatility to play safety or corner. He played in five games for the Lions last season and made 11 tackles. Carey was cut before the 2012 season.