Osemele has played in all seven games for the Ravens and Ravens coach John Harbaugh said he's been dealing with the back issue since last year.
Pierce aggravated the hamstring injury in Sunday's loss to the Pittsburgh Steelers. Bynes missed the game against the Steelers after having surgery last week to remove the infection. Bynes said that he expects to play next Sunday against the Cleveland Browns.
The Ravens won't have to disclose an official injury report until next Wednesday. After today's practice, the Ravens will be off until Monday per rules of the collective bargaining agreement.