Hoyer is being brought in to bolster a quarterback group missing injured starter Ben Roethlisberger and now Leftwich, who the team ruled out against the Browns due to multiple rib fractures. The Burress addition is the result of injuries to Antonio Brown and Jerricho Cotchery. Coach Mike Tomlin confirmed Tuesday that Cotchery has been ruled out against the Browns with the same rib injury Leftwich is suffering from.