PITTSBURGH (AP) - Ben Roethlisberger's sprained right shoulder is just the start of his problems.

The Pittsburgh Steelers quarterback said Tuesday he also dislocated a rib while getting sacked in the third quarter of Monday night's win against Kansas City. Roethlisberger sprained the SC joint in his shoulder on the play but says the rib issue is a bigger concern.

Roethlisberger said doctors are concerned the rib could cut into his aorta. He's already been ruled out of Sunday's game against the Baltimore Ravens. Backup Byron Leftwich will start in his place.

Roethlisberger said there is no timetable for his return because of the unusual nature of the injury. He is hopeful that he can return at some point but added he's in considerable pain and has slept just four hours over the last two nights.

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