The 29-year-old Clemens has a home in St. Louis and stayed in town after getting released with the understanding the Rams would add him to the roster when they could.
Clemens made three starts last year, completing 52.7 percent of his passes for 546 yards with two touchdowns and an interception.
Scott played in 13 games with one start last season. He was a fourth-round pick in 2009.
Copyright 2012 by The Associated Press