Baltimore Ravens quarterback Joe Flacco and head coach John Harbaugh celebrate after defeating the New England Patriots after the AFC Championship playoff football game at Gillette Stadium on Sun Jan.20,2013. (AP Photo/Tom DiPace)

Baltimore Ravens quarterback Joe Flacco celebrates after teammate Willis McGahee scored on a 25-yard touchdown run during the fourth quarter of an NFL AFC wild card football playoff game against the Kansas City Chiefs Sunday, Jan. 9, 2011, in Kansas City, Mo. The Ravens defeated the Chiefs 30-7. (AP Photo/Jeff Roberson)

Baltimore Ravens quarterback Joe Flacco (5) steps back to pass as tackle Michael Oher (74) blocks Denver Broncos defensive end Robert Ayers (91) in the first quarter of an AFC divisional playoff NFL football game, Saturday, Jan. 12, 2013, in Denver. (AP Photo/Jack Dempsey)

Baltimore Ravens quarterback Joe Flacco passes the during the first half of an NFL football game against the Pittsburgh Steelers in Baltimore, Sunday, Dec. 2, 2012. (AP Photo/Gail Burton)

Baltimore Ravens quarterback Joe Flacco (5) passes during an NFL game against the San Diego Chargers on Sunday, Nov. 25, 2012, in San Diego. The Ravens won the game, 16-13. (AP Photo/Greg Trott)

Baltimore Ravens quarterback Joe Flacco (5) rolls out to pass the ball for a touchdown during an AFC Wild Card NFL football game between the Baltimore Ravens and the Indianapolis Cots in Baltimore, MD Sunday, January 6, 2013. (AP Photo/Tom Hauck)

Baltimore Ravens quarterback Joe Flacco (5) celebrates his touchdown run as Cleveland Browns outside linebacker Scott Fujita watches during the second half of an NFL football game in Baltimore, Thursday, Sept. 27, 2012. (AP Photo/Patrick Semansky)

Baltimore Ravens quarterback Joe Flacco reacts after throwing a touchdown pass against the Cincinnati Bengals in the first half of an NFL football game, Sunday, Jan. 1, 2012, in Cincinnati. (AP Photo/Darron Cummings)

Baltimore Ravens quarterback Joe Flacco (5) and tight end Dennis Pitta react after Pitta scored a touchdown in the first half of an NFL football game against the New England Patriots in Baltimore, Sunday, Sept. 23, 2012. (AP Photo/Nick Wass)

Pittsburgh Steelers' Troy Polamalu reaches out to sack Baltimore Ravens quarterback Joe Flacco during the third quarter of the NFL AFC championship football game in Pittsburgh, Sunday, Jan. 18, 2009. (AP Photo/Gene J. Puskar)

Baltimore Ravens quarterback Joe Flacco in action against the Miami Dolphins during the AFC wildcard playoff game in Miami, Sunday, Jan. 4, 2009. (AP Photo/J. Pat Carter)

Baltimore Ravens quarterback Joe Flacco (5) passes under pressure from Cincinnati Bengals defensive tackle Pat Sims (90) in the second quarter of an NFL football game, Sunday, Nov. 30, 2008, in Cincinnati. (AP Photo/David Kohl)

Baltimore Ravens quarterback Joe Flacco looks to pass against the Philadelphia Eagles during a NFL football game Sunday, Nov. 23, 2008 in Baltimore. (AP Photo/Gail Burton)

Baltimore Ravens quarterback Joe Flacco (5) looks to pass as Cleveland Browns defensive end Louis Leonard (93) pursues during an NFL football game, Sunday, Sept. 21, 2008, in Baltimore. The Ravens won 28-10.(AP Photo/Nick Wass)

Joe Flacco #5 of the Baltimore Ravens drops back to pass during a preseason game against the St. Louis Rams on August 23, 2008 at the Edward Jones Dome in St. Louis, Mo. (AP Photo/G. Newman Lowrance)

Baltimore Ravens quarterback Joe Flacco passes during the first half of an NFL football game against the Miami Dolphins in Baltimore, Sunday, Nov. 7, 2010. (AP Photo/Nick Wass)

Baltimore Ravens quarterback Joe Flacco (5) scrambles out of the pocket against the Atlanta Falcons at the Georgia Dome in Atlanta, Georgia on Nov. 11, 2010. (AP Photo/Ben Liebenberg)

Baltimore Ravens Joe Flacco plays in a game against the Arizona Cardinals at M&T Bank Stadium in Baltimore, MD. October 30, 2011. ( AP Photo/Tom DiPace)

SEATTLE - NOVEMBER 13:Joe Flacco #5 of the Baltimore Ravens throws the ball against the Seattle Seahawks at CenturyLink Field on November 13, 2011 in Seattle, Washington. The Seahawks defeated the Ravens 22-17. (AP Photo/Tom Hauck)

Baltimore Ravens quarterback Joe Flacco (5) looks to throw the ball under pressure from San Francisco 49ers outside linebacker Ahmad Brooks (55) during an NFL football game at M&T Bank Stadium in Baltimore, Thursday, Nov. 24, 2011. (AP Photo/Ben Liebenberg)

PITTSBURGH, PA - JANUARY 18: Quarterback Joe Flacco #5 of the Baltimore Ravens runs with the football as he looks for a receiver down field against the Pittsburgh Steelers during the AFC Championship Playoff Game at Heinz Field on January 18, 2009 in Pittsburgh, Pennsylvania. The Steelers defeated the Ravens 23-14. (AP Photo/Scott Boehm)

Baltimore Ravens quarterback Joe Flacco (5) moves in the pocket in the first quarter of an NFL football game between the Baltimore Ravens and the Atlanta Falcons, Thursday, Nov. 11, 2010 in Atlanta. (AP Photo/John Bazemore)

Baltimore Ravens quarterback Joe Flacco #5 throwing the football while guard Chris Chester #65 blocks Pittsburgh Steelers defensive end Ziggy Hood #96, week thirteen, during the NFL football game between the Pittsburgh Steelers against the Baltimore Ravens on Sunday, December 5, 2010 at M & T Bank Stadium in Baltimore, Maryland. The Steelers beat the Ravens 13-10. (AP Photo/David Drapkin)

Pittsburgh Steelers linebacker James Harrison (92) chases Baltimore Ravens quarterback Joe Flacco (5) during the NFL 2011 AFC Divisional playoff football game against the Baltimore Ravens on Saturday, January 15, 2011 in Pittsburgh, Pennsylvania. The Steelers won the game 31-24. (AP Photo/Paul Spinelli)

Quarterback Joe Flacco #5 of the Baltimore Ravens is sacked for a loss by defensive end Brett Keisel #99 of the Pittsburgh Steelers during their Division Playoff match up on Saturday, January 15, 2011 in Pittsburgh, PA. The Steelers won the game 31-24 . (AP Photo/Thomas E. Witte)

Baltimore Ravens quarterback Joe Flacco passes during the NFL divisional football playoff game against the Indianapolis Colts, Saturday, Jan. 16, 2010 in Indianapolis. (AP Photo/AJ Mast)

Baltimore Ravens quarterback Joe Flacco passes during the first quarter of the NFL divisional football playoff game against the Indianapolis Colts, Saturday, Jan. 16, 2010 in Indianapolis. (AP Photo/Darron Cummings)

Joe Flacco of the Baltimore Ravens holds his trophy during the "2008 Diet Pepsi Rookie of the Year Press Conference" held at the Super Bowl XLIII Media Center in the Tampa Convention Center on January 29, 2009 in Tampa, Florida. (AP Photo/Paul Spinelli)

Baltimore Ravens first round draft pick, quarterback Joe Flacco, holding jersey, is surrounded by members of the team's staff, coach John Harbaugh, far left, general manager Ozzie Newsome, right, and director of college scouting Eric DeCosta, far right, during a news conference, Sunday, April 27, 2008, in Owings Mills, Md. Flacco, who played college football at Delaware, was selected by the Ravens with the No. 18 pick. (AP Photo/Rob Carr)

Quarterback Joe Flacco of Delaware runs a drill at the NFL Combine in Indianapolis, Sunday, Feb. 24, 2008. (AP Photo/Michael Conroy)

North Team quarterback Joe Flacco, of Delaware, looks for a receiver in the first half of the Senior Bowl football game at Ladd-Peebles Stadium in Mobile, Ala., Saturday, Jan. 26, 2008. (AP Photo/Dave Martin)

Delaware quarterback Joe Flacco (5) looks to hand off during a college football game against Rhode Island in South Kingstown, R.I. on Saturday, Sept. 23, 2006. (AP Photo/Joe Giblin)