Mitchell (lower body) did not participate in Thursday's practice, Zach Berman of The Athletic reports.
Mitchell exited Wednesday's practice session with a glute injury and was unable to return to the field. The cornerback has now missed another session, and he appears highly unlikely to play in Saturday's preseason opener against the Ravens. With Jonathan Jones (shoulder) also managing an injury, Kelee Ringo has a good chance to see significant reps throughout the preseason.