PITTSFORD, N.Y. (AP) Buffalo Bills rookie linebacker Reggie Ragland left practice Friday with a left knee injury.

Bills coach Rex Ryan says the team does not believe any knee ligaments were damaged, but Ragland will undergo further testing to determine the severity of the injury.

The non-contact injury took place in a team drill near the end of Buffalo's morning practice. Ragland was going after the ball carrier on a running play before pulling up and going to the ground. He was able to walk to the locker room under his own power.

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Ragland is projected to start at inside linebacker for Buffalo after being drafted 41st overall. The Bills are already without first-round pick Shaq Lawson, projected to start at outside linebacker.

In other Bills injury news, Ryan said defensive tackle Marcell Dareus (undisclosed non-football illness) will likely return to practice on Monday.

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AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL