Callahan was claimed off waivers by the Browns on Monday, Cleveland.com reports.
After an impressive preseason with the Packers followed be a brief stint with the Saints, Callahan was presumably claimed by Cleveland due to the fact that starting signal caller Cody Kessler resides in the concussion protocol. Moreover, it's still uncertain when Josh McCown (collarbone) will return. If neither Kessler or McCown can play this week, rookie Kevin Hogan will likely get the start given his familiarity with head coach Hue Jackson's offensive scheme, leaving Callahan to claim backup status for his first game with his new team.