Denver Broncos quarterback Peyton Manning enters the field before taking on the San Diego Chargers at Sports Authority Field at Mile High in Denver. (Ric Tapia/NFL)

Kansas City Chiefs defensive end Jaye Howard (96) blocks St. Louis Rams running back Zac Stacy (30) and strong safety T.J. McDonald (25). (AP Photo/Ed Zurga)

New York Jets Saalim Hakim (15) dives to tackle a celebrating Buffalo Bills wide receiver Sammy Watkins (14), who thought he had a clear run to the end zone. (AP Photo/Kathy Willens)

Carolina Panthers cornerback Josh Norman defends a pass intended for Seattle Seahawks wide receiver Paul Richardson. The Seahawks defeated the Panthers, 13-9. (Perry Knotts/NFL)

Chicago Bears tight end Martellus Bennett (83) catches a touchdown pass in front of New England Patriots strong safety Patrick Chung (23). (AP Photo/Elise Amendola)

Detroit Lions wide receiver Jeremy Ross (12) leaps over a challenge by Atlanta Falcons strong safety Kemal Ishmael at Wembley Stadium, London. (AP Photo/Tim Ireland)

Philadelphia Eagles wide receiver Riley Cooper sits in the end zone after the Arizona Cardinals prevailed, 24-20. (AP Photo/Rick Scuteri)

New England Patriots defensive end Zach Moore (90) forces Chicago Bears quarterback Jay Cutler to fumble. (AP Photo/Steven Senne)

Denver Broncos wide receiver Emmanuel Sanders celebrates his touchdown catch against the San Diego Chargers at Sports Authority Field at Mile High in Denver. (Ric Tapia/NFL)

New England Patriots tight end Rob Gronkowski carries Chicago Bears defensive back Al Louis-Jean into the end zone while scoring a touchdown. (AP Photo/Steven Senne)