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San Francisco 49ers quarterback Nate Davis, pictured right, runs with the ball past San Diego Chargers linebacker Brandon Siler, pictured left, during the second quarter of their preseason game in San Francisco, on Thursday.

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Carolina Panthers tight end Dante Rosario, pictured right, catches a pass behind Pittsburgh Steelers safety Troy Polamalu, pictured left, for a first down in the first quarter of the NFL preseason game in Pittsburgh, on Thursday.

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Tennessee Titans recevier Marc Mariani, pictured left, hauls in a 46-yard pass as New Orleans Saints cornerback Reggie Jones, pictured right, defends during the second half their NFL preseason game at LP Field in Nashville, Tenn., on Thursday. Tennessee won 27-24.

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St. Louis Rams tight end Fendi Onobun, pictured right, catches a pass for a 15-yard gain as Baltimore Ravens cornerback K.J. Gerard, pictured left, closes in during the fourth quarter of a preseason NFL football game on Thursday in St. Louis.

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Denver Broncos quarterback Tim Tebow throws a pass during the fourth quarter of a preseason game against the Minnesota Vikings in Minneapolis on Thursday.

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Miami Dolphins wide receiver Davone Bess, pictured left, fights for extra yardage against Dallas Cowboy Herb Donaldson, pictured right, in the first half of a preseason NFL game, on Thursday in Arlington, Texas.

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New York Jets wide receiver Santonio Holmes celebrates after scoring a touchdown in the second half of an NFL preseason game against the Philadelphia Eagles, on Thursday in Philadelphia.

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Indianapolis Colts tight end Gijon Robinson, pictured left, is tackled by Cincinnati Bengals safety Kyries Hebert, pictured right, during the fourth quarter of an NFL preseason game in Indianapolis, on Thursday. Cincinnati won 30-28.

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Arizona Cardinals wide receiver Larry Fitzgerald warms up prior to an NFL preseason game against the Washington Redskins on Thursday Glendale, Ariz.

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Kansas City Chiefs wide receiver Jerheme Urban, pictured left, drops a pass while covered by Green Bay Packers cornerback Sam Shields, pictured right, during the first half of a preseason NFL game in Arrowhead Stadium in Kansas City, Mo., on Thursday.