ESPN NFL

Posted by ESPN.com's James Walker

Here are the most interesting story lines in the AFC North:

• A source told ESPN's Chris Mortensen that Baltimore Ravens quarterback Kyle Boller has a partially-torn labrum in his throwing shoulder. Boller will receive treatment for the next week or so before deciding whether to have season-ending surgery.

Morning take: First Chad Johnson, and now Boller. But this will be a much tougher injury to overcome for a quarterback, especially to the throwing shoulder. Our guess is Boller eventually decides to shut it down.

• Geoff Hobson of Bengals.com writes Cincinnati defensive coordinator Mike Zimmer is not happy with his defense and wants to see improvement tonight against the Indianapolis Colts.

Morning take: We are a little surprised, too, with how poorly this unit has played this summer. It's hard to see where this unit's strength is, especially if the secondary fails to cover anybody.

• Former Pro Bowl receiver Joe Horn tells ESPN.com he would love to be the No. 3 receiver for the Cleveland Browns this season.

Morning take: Horn would be a good fit, but the Browns don't seem interested in adding a third receiver. Cornerback is the team's most pressing need for now.

• According to Ray Fittipaldo of the Pittsburgh Post-Gazette, the Steelers are thinking about keeping four quarterbacks on their active roster.

Morning take: The Steelers should play it safe with backup Charlie Batch, who should be ready to return from a broken collarbone around late September. Putting Batch on the physically unable to perform list (PUP) would save a roster spot for six games and buy Batch a few more weeks to make sure he's 100 percent.