Tampa Bay Buccaneers tight end Kellen Winslow carries a British flag onto the field before an NFL football game against the Chicago Bears Sunday, Oct. 23, 2011, at Wembley Stadium in London. (AP Photo/David J. Phillip)

The St. Louis Cardinals huddle up during a 20-10 preseason victory over the San Diego Chargers on August 15, 1976, at Korakuen Stadium in Tokyo, Japan. (National Football League)

A St. Louis Rams supporter arrives prior to a NFL football game between St Louis Rams and the New England Patriots at Wembley Stadium, London, Sunday, Oct. 28, 2012. (AP Photo/Matt Dunham)

(L-R) Head coach Tony Dungy of the Indianapolis Colts, Arthur Blank, the owner of the Atlanta Falcons, Quarterback Peyton Manning #18 of the Indianapolis Colts, Roger Goodell, Executive vice-president of the NFL, Quarterback Michael Vick #7 of the Atlanta Falcons, James lrsay the owner of the Indianapolis Colts and head coach Jim Mora of the Atlanta Falcons pose for photos during a press conference at Tokyo Dome on August 4, 2005 in Tokyo, Japan. The Indianapolis Colts will play the Atlanta Falcons in the American Bowl on August 6. (Junko Kimura/Getty Images)

Cheerleaders for the St. Louis Rams NFL team and their mascot Rampage pose for photographs on the Abbey Road zebra crossing made famous by the Beatles in London, Wednesday, Oct. 24, 2012. The Rams are to play the New England Patriots at Wembley stadium in London, Sunday, Oct. 28 in a regular season NFL game. (Dave Shopland/NFL)

Denver Broncos quarterback John Elway jokes with two British policemen upon his team?s arrival outside Gatwick Airport on Monday, August 3, 1987 in London. The Broncos are in town to meet the Los Angeles Rams in an exhibition football game at London?s Wembley Stadium on August 9. (AP Photo/Dave Gaywood)

Estadio Azteca stadium before a regular season NFL game between the Arizona Cardinals and the San Francisco 49ers at Estadio Azteca in Mexico City, Mexico on October 2, 2005. This is the first ever regular season game being played outside the United States. (Mike Ehrmann/WireImage)

Estadio Azteca stadium during a regular season NFL game between the Arizona Cardinals and the San Francisco 49ers at Estadio Azteca in Mexico City, Mexico on October 2, 2005. This is the first ever regular season game being played outside the United States. (Mike Ehrmann/WireImage)

Ben Roethlisberger, quarterback of the Pittsburgh Steelers, poses for photographers, backdropped by the Houses of Parliament and Big Ben in central London, Tuesday, July 2, 2013. Pittsburgh Steelers will play against the Minnesota Vikings at Wembley Stadium in London, on Sunday Sept. 29, 2013. (AP Photo/Lefteris Pitarakis)

Pete Stoyanovich #10 of the Kansas City Chiefs kicks off to start the NFL American Bowl Game against the Green Bay Packers at the Tokyodome in Tokyo, Japan. The Packers defeated the Chiefs 27-24 in overtime. (Harry How/Allsport)

Walter Payton, Chicago Bears running back, points the way to the buses on arrival in London on Monday, July 28, 1986. The Bears play Dallas Cowboys next Sunday at London's Wembley Stadium. (AP Photo/Charlie Bennett)

NFL flags line Regent Street in London in preparation for the international football game between the Pittsburgh Steelers and the Minnesota Vikings at Wembley Stadium. (AP Photos/Gerard Farrell)

Philadelphia Eagles quarterback Randall Cunningham, left, and Cleveland Browns' quarterback Bernie Kosar shown together during a training session at Crystal Palace in London, Aug. 1, 1989. (AP Photo/Gill Allen)

Miami Dolphins quarterback, Dan Marino (13), is pictured during a friendly encounter with two London Police Constables, Dennis Grey, right, and John Lugg, left, during a training session at Crystal Palace,Tuesday, July 26, 1988, London, England. The Miami Dolphins will meet the San Francisco 49ers in at Wembley Stadium on July 31 1988. (AP Photo/Doug Jennings)

Los Angeles Raiders Steve Strachan finds an obstacle in his path in Calvin Nicholson of the New Orleans Saints in the American Bowl on Sunday, August 6, 1990 at London's Wembley Stadium. The Saints beat the Raiders, 17-10. (AP Photo/Gillian Allen)

Japanese football fans applaud the action in the 2005 American Bowl at the Tokyo Dome on August 6 in Tokyo, Japan. The Atlanta Falcons defeated the Colts 27 - 21. (Al Messerschmidt/WireImage)

Philadelphia Eagles running back James Joseph (32) breaks away from Kirby Jackson (47) and Mark Kelso (38, right) of the Buffalo Bills during American Bowl 1991 at Wembley Stadium in London, July 28, 1991. The Buffalo Bills won the match 17-13. (AP Photo/Alistair Grant)

Wide receivers Anquan Boldin and Larry Fitzgerald of the Arizona Cardinals celebrate after a touchdown during a game against the San Francisco 49ers at Estadio Azteca in Mexico City, Mexico on October 2, 2005. This is the first ever regular season game being played outside the United States. (Mike Ehrmann/WireImage)

San Francisco 49ers running back Roger Craig holds onto the ball as he flies past Miami Dolphins John Offerdahl during the annual American Football exhibition match on July 31, 1988 at London's Wembley Stadium. The NFL sponsored exhibition match has become an annual event. (Associated Press)

Brandon Jacobs #27 of the Giants is brought down during the NFL Bridgestone International Series match between New York Giants and Miami Dolphins at Wembley Stadium on October 28, 2007 in London, England. (Richard Heathcote/Getty Images)

San Francisco 49ers running back Terrence Flagler flies over the top to touchdown in the end zone for a penalty call just before halftime, Sunday, July 31, 1988 against the Miami Dolphins London's Wembley Stadium, during the annual American Football Exhibition match. Number 29 for the Dolphins is Liffort Hobley. (Associated Press)

Tory James of the Broncos scores a touchdown during the against the San Diego Chargers during the American Bowl at Stadium Australia in Sydney, Australia on August 8, 1999. Denver Broncos won 20-17. (Nick Wilson/ALLSPORT)

Head coach Bill Cowher of the Pittsburgh Steelers celebrates with the trophy after a victory against the Chicago Bears in the American Bowl at Cloke Park on on July 27, 1997 in Dublin, Ireland. The Steelers won the game 30-17. (Clive Brunskill/Allsport)

Three cheerleaders pose for the camera with an English policeman in Covent Garden Market, London, prior to the American Bowl. (Allsport)

George Seifert, NFL Commissioner Pete Rozelle (center) and Ed Debartolo (right) hold the trophy at the American Bowl in London, England on August 16, 1992. (Howard Boyland/Allsport)

Troy Aikman of the Cowboys at the 1994 American Bowl between the Houston Oilers and the Dallas Cowboys in Mexico City on August 15, 1994. The Oilers beat the Cowboys 6-0. (James D. Smith/WireImage)

Quarterback Matt Schaub #8 of the Atlanta Falcons hold a Japanese sword after the game against the Indianapolis Colts during the NFL's preseason opener, "NFL Tokyo 2005" on August 6, 2005 at Tokyo Dome in Tokyo, Japan. The Falcons defeated the Colts 27-21. (Koichi Kamoshida/Getty Images)

The American and Mexican flags are displayed on the field during the pre-game ceremony before the game between the Arizona Cardinals and the San Francisco 49ers at Estadio Azteka on October 2, 2005 in Mexico City, Mexico. (Robert Laberge/Getty Images)

Estadio Azteca is shown during the Arizona Cardinals game against the San Francisco 49ers on October 2, 2005 in Mexico City, Mexico. The Cards defeated the Niners 31-14. (Robert Laberge/Getty Images)

Japanese football fans applaud the action in the 2005 American Bowl August 6 at the Tokyo Dome in Japan. The Atlanta Falcons defeated the Colts 27 - 21. (Al Messerschmidt/WireImage)

Mexican fans enjoy the 1998 American Bowl between the New England Patriots and the Dallas Cowboys at Azteca Stadium on July 17, 1998 in Mexico City, Mexico. The Patriots beat the Cowboys 21 to 3. Photo by James D. Smith/WireImage.com

Robert Griffith (34) of the Arizona Cardinals carries out the Mexican flag before a game against the San Francisco 49ers at Estadio Azteca in Mexico City, Mexico on October 2, 2005. This is the first ever regular season game being played outside the United States. (Mike Ehrmann/WireImage)

San Francisco 49ers and the Arizona Cardinals at Azteca Stadium in Mexico City, Mexico on October 2, 2005. The Arizona Cardinals won 31-14 over the 49ers. (Terrell Lloyd/WireImage)

'Pat Patriot', NFL's The New England Patriots mascot poses for pictures in central London's Trafalgar Square on Friday Oct. 23, 2009. The Patriots will play Tampa Bay Buccaneers at London's Wembley Stadium on Sunday Oct. 25. (AP Photos/Lefteris Pitarakis)

San Diego Chargers Antonio Gates, center, is tackled during the NFL football match between San Diego Chargers and New Orleans Saints at Wembley Stadium in London, Sunday Oct. 26, 2008. (AP Photo/Matt Dunham)

Philadelphia Eagles running back Keith Byars carries the football during the Eagles 17-13 preseason victory over the Cleveland Browns in the 1989 American Bowl on August 6, 1989 at Wembley Stadium in London, England - United Kingdom. (National Football League)

New England Patriots quarterback Tom Brady (12) passes the ball during an NFL football game at Wembley Stadium, London, Sunday Oct. 25, 2009. (AP Photo/Tom Hevezi)

San Francisco 49ers' Josh Morgan, right, and Denver Broncos' Brian Dawkins, left, compete for the ball during the NFL Football match between the Denver Broncos and San Francisco 49ers at Wembley Stadium in London, Sunday Oct. 31, 2010. (AP Photo/Alastair Grant)

Chicago Bears Brian Urlacher tries his hand at cricket during a team training session at the Oval cricket ground, London, Friday Oct. 21, 2011. The Bears will face the Tampa Bay Buccaneers at London's Wembley stadium on Sunday. (AP Photo/Tom Hevezi)

Chicago Bears strong safety Chris Harris (46) chases Tampa Bay Buccaneers wide receiver Dezmon Briscoe (89) as he steps into the end zone to score on a 24-yard touchdown pass during the second half of an NFL football game Sunday, Oct. 23, 2011, at Wembley Stadium in London. (AP Photo/Matt Dunham)

Minnesota Vikings running back Adrian Peterson (28) evades a tackle by Pittsburgh Steelers linebacker LaMarr Woodley (56) to score on a 60-yard touchdown run during the first half of their NFL football game at Wembley Stadium, London, Sunday,Sept. 29, 2013. (AP Photo/Matt Dunham)

United States' National Football League players, from left, Minnesota Vikings' Jared Allen and Kevin Williams, Pittsburgh Steelers' Ramon Foster, Jacksonville Jaguars' Uche Nwaneri, and San Francisco 49ers' Donte Whitner pose for photographers at Wembley Stadium in London, Tuesday, July 16, 2013. As part of International Series regular-season games in 2013, the NFL will stage two games at Wembley Stadium: Pittsburgh Steelers against Minnesota Vikings on Sept. 29 and San Francisco 49ers against Jacksonville Jaguars on Oct. 27, 2013. (AP Photo/Lefteris Pitarakis)

The Pittsburgh Steelers, left, kick off to the Minnesota Vikings to start their NFL game at Wembley Stadium, London, Sunday, Sept. 29, 2013. (Nicky Hayes/NFL)

St. Louis Rams Daryl Richardson leaps to make a reception during a NFL International Series Football game against the New England Patriots on Oct 28, 2012 in London. (AP Photo/G. Newman Lowrance)

Los Angeles Rams running back Charles White, left, runs towards his first of two touchdowns against the Denver Broncos during the third quarter of the American Bowl on Sunday, August 9, 1987 in London's Wembley Stadium. The Rams won the game 28-27. (AP Photo/Ed Andrieski)

Los Angeles Rams running back Charles White, 33, goes up and over, reaching for the goal line at lower left, for his second touchdown against the Denver Broncos in the American Bowl, Sunday, August 9, 1987 at London's Wembley Stadium. White Scored from four yards out, tying the game at 27-27 with less than a minute to go. The Rams went on to win 28-27. (AP Photo/Douglas C. Pizac)