The Bills placed DT Torell Troup on injured reserved because of a nagging back injury, the team announced Wednesday. To take his roster spot, the team promoted DE Lionel Dotson from the practice squad.
Troup, a 2010 second-round pick, missed Sunday's loss against the Jets and five games total this season. He has eight tackles in six games this season. He is the ninth key contributor the Bills' have placed on I.R. this season.
Dotson was a seventh-round pick of the Dolphins in 2008, and has appeared in six games in his career. To replace Dotson on the practice squad, the team signed LB Robert Eddins.