Clausen and Palmer had been competing to back up Jay Cutler throughout training camp, with Chicago making the call for Clausen after the team's third preseason game last Friday against the Seattle Seahawks.
The former Notre Dame quarterback was signed by the Bears in June.
Clausen, a former second-round pick of the Carolina Panthers, played for Carolina from 2010 through last season. He started 10 games for the Panthers in his rookie season and throwing for 1,558 yards, three touchdowns and nine interceptions. He has not seen any other game action.
Palmer, the younger brother of Arizona Cardinals starting quarterback Carson Palmer, joined the Bears last season after stints with the Jacksonville Jaguars, Cincinnati Bengals, Washington Redskins, an Arena league team and a United Football League team. He expressed no hard feelings about the Bears' decision to release him.
- Ben Estes