The Buffalo Bills' LeSean McCoy stands on the sidelines during his team's loss to the Philadelphia Eagles. (AP Photo/Matt Rourke)

Pittsburgh Steelers coach Mike Tomlin reacts after defeating the Cincinnati Bengals at Paul Brown Stadium. Mandatory Credit: Aaron Doster-USA TODAY Sports

New Orleans Saints running back Tim Hightower celebrates as he scores a touchdown against the Tampa Bay Buccaneers . Mandatory Credit: Kim Klement-USA TODAY Sports

Kansas City Chiefs linebacker Dee Ford pats San Diego Chargers quarterback Philip Rivers on the helmet. The Chiefs won 10-3. (AP Photo/Ed Zurga)

Houston Texans defensive end J.J. Watt bursts through smoke to make his way on to the field to face the New England Patriots (Aaron M. Sprecher via AP)

Washington Redskins tight end Jordan Reed (86) spikes the ball as he celebrates a touchdown against the Chicago Bears. (AP Photo/Charles Rex Arbogast)

The Green Bay Packers' Clay Matthews sacks Dallas Cowboys quarterback Matt Cassel. (AP Photo/Morry Gash)

Khalil Mack celebrates one of his five sacks in the Oakland Raiders' win over the Denver Broncos. (Ric Tapia/NFL)

Seattle Seahawks cornerback Richard Sherman gets his hair pulled while being tackled by Baltimore Ravens wide receiver Chris Matthews. Mandatory Credit: Evan Habeeb-USA TODAY Sports

St. Louis Rams running back Todd Gurley scores between Detroit Lions linebacker Josh Bynes (left) and free safety Glover Quin on a five-yard run. (AP Photo/Tom Gannam)