Ben Roethlisberger's sprained right shoulder is just the start of his problems.

The Pittsburgh Steelers quarterback said Wednesday that 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 already has been ruled out of Sunday's game against the Baltimore Ravens. Backup Byron Leftwich will start in his place, though Roethlisberger doesn't believe the injuries will end his season.

"I don't think so, I don't know though, but I'm not a medical expert," Roethlisberger said. "I just know I'm going to do what I can to get back."

Roethlisberger added he's in considerable pain and had slept just four hours over the previous two nights. He was wearing a sling to prevent the rib from moving around. Doctors are worried if the rib gets jostled before it heals, it could cause internal bleeding.

"I can move (the arm) around, that's not the issue," Roethlisberger said. "Sometimes when I do move it, the rib will kind of pop out of place again, which is pretty painful. I just try to keep it as still as I can for the most part."

The quarterback added the pain level is "nine on a scale of 1-10."

Roethlisberger underwent extensive testing Tuesday to determine the extent of the injury to his throwing shoulder. He was waiting further word Wednesday about how to move forward because of the unusual nature of the injury.

"From what (the doctor) said, he's trying to talk to experts because there is no case study over the exact same thing," Roethlisberger said. "From what I heard, from what he told me, it was a 1998 rugby player or something."

Leftwich will be making his first start since 2009 when he played for the Tampa Bay Buccaneers.

Eagles: Quarterback Michael Vick did not practice Wednesday but has not yet been ruled out of Sunday's game against the Washington Redskins.

Vick suffered a concussion in the second quarter of a 38-23 loss to the Dallas Cowboys on Sunday. Backup Nick Foles, a rookie, took the first-team snaps at Wednesday's practice and would make his first career start should Vick not be able to play.

"Michael's in a good place," coach Andy Reid said. "He's hurting a little bit from the concussion, but he's in a good place. I haven't tried to overburden him right now."

Vick was diagnosed with a significant concussion and told to stay home and rest. His headaches are subsiding, Reid says, but the veteran still needs to complete the mandated concussion testing.

Chiefs: Matt Cassel will get another start at quarterback for Kansas City. Brady Quinn still has not been cleared to participate in a game following his concussion, so Cassel will be back under center when the Chiefs play the Cincinnati Bengals on Sunday.

Packers: Linebacker Clay Matthews will miss Sunday's game in Detroit with a hamstring injury. Matthews was hurt in the second half of Green Bay's Nov. 4 game against Arizona.

Texans: Linebacker Tim Dobbins was fined $30,000 for a helmet-to-helmet hit that gave Chicago quarterback Jay Cutler a concussion. Dobbins said he plans to appeal.

Cowboys: Receiver Dez Bryant has agreed to a year of anger management counseling as part of a deal that could lead to the dismissal of a family violence charge over a dispute with his mother.

Attorney Royce West said Bryant was already attending anger management sessions, and he said the Dallas County district attorney's office would dismiss the misdemeanor charge if Bryant stays out of trouble for a year.

Bryant was arrested in July in suburban Dallas after he allegedly hit his mother, Angela Bryant, in the face with a ball cap. A police affidavit says he also grabbed his mother by her T-shirt. Bryant's mother filed an affidavit asking prosecutors not to file charges.