O'Sullivan completed only 35 of 60 passes for 396 yards with two interceptions and five sacks during five preseason games, working with the Bengals' second-string players. He appeared in only three games last season as Carson Palmer's backup.
Palmer's younger brother, Jordan, is the third-string quarterback.
The Bengals replaced O'Sullivan -- at least temporarily -- by claiming quarterback Dan LeFevour off waivers from Chicago on Sunday. LeFevour was a sixth-round pick from Central Michigan, where he threw for more than 12,000 yards and ran for more than 2,500 during his career.
LeFevour's coach at Central Michigan was Butch Jones, who is in his first season at the University of Cincinnati.
Copyright 2010 by The Associated Press
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