The Giants officially placed CB Terrell Thomas on injured reserve Tuesday and signed veteran DT Jimmy Kennedy.
The team also waive/injured CB Brain Witherspoon, who tore his ACL in Monday night's win over the Bears, and WR Sam Gigure.
Kennedy, an eighth-year veteran, played in nine games last season for the Vikings and recorded eight tackles. He has played for the Rams, Bears, Jaguars and Vikings in his career, recording 8½ sacks.