Zack Bowman, Marcus Harrison hurt

CHICAGO -- Bears defensive end Corey Wootton suffered a knee injury on the opening kickoff of Saturday's preseason opener against the Bills, and was declared out for the game, team officials said.

A second-year player, Wootton appeared to be poised for a breakout sophomore campaign, based on how he had performed during the first two weeks of training camp.

The extent of Wootton's injury wasn't immediately known.

Wootton's wasn't the only injury along the Bears' defensive line; tackle Marcus Harrison endured a stinger making a tackle in the second quarter

Although team officials said Harrison was questionable to return, he remained on the sidelines for the duration of the game. The injury didn't appear to be serious as he was seen just minutes later on the sidelines laughing with teammates.

The Bears' already-thin secondary also didn't survive Saturday night's action unscathed; Zack Bowman suffered a head injury in the third quarter, after delivering a hard hit to Bills receiver Paul Hubbard.

The defensive back stayed on the ground for several minutes following impact. Bowman walked off the field under his own power but was ruled out for the remainder of the game.

The injury is not believed to be serious. A source familiar with the situation called the Bears decision to shut Bowman down for the rest of the night "precautionary."

Michael C. Wright and Jeff Dickerson cover the Bears for ESPNChicago.com.