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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.

Quarterback Joe Flacco of Delaware runs a drill at the NFL Combine in Indianapolis, Sunday, Feb. 24, 2008.

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.

Baltimore Ravens' first round draft pick quarterback Joe Flacco (5) runs drills during a football mini-camp, Friday May 9, 2008 in Owings Mills, Md.

Baltimore Ravens first-round draft pick Joe Flacco (5) gets ready to throw a pass during an NFL football minicamp alongside teammates Troy Smith (10) and Kyle Boller (7), Friday, May 9, 2008, in Owings Mills, Md.

Baltimore Ravens quarterback Joe Flacco, left, and general manager Ozzie Newsome, right, laugh during a news conference, Monday, July 21, 2008, in Westminster, Md. Flacco formally signed his contract Monday and reported to coach John Harbaugh's first training camp, along with other rookies, quarterbacks and injured players.

Baltimore Ravens quarterback Joe Flacco signs autographs during the first day of football training camp, Tuesday, July 22, 2008, in Westminster, Md.

Quarterback Joe Flacco #5 of the Baltimore Ravens drops back to make a pass play against the St. Louis Rams during the NFL game at the Edward Jones Dome on Aug. 23, 2008 in St. Louis, Missouri.

Baltimore Ravens Joe Flacco hands off to Ray Rice during the 2nd half of their game at M&T Bank Stadium in Baltimore.

Baltimore Ravens quarterback Joe Flacco (5) sits on the turf after getting hit by Denver Broncos outside linebacker Von Miller (58) in the third quarter Sunday, Dec. 16, 2012 at M&T Bank Stadium.

Baltimore Ravens quarterback Joe Flacco (5) waits to run onto the field before the start of the game. The Denver Broncos vs Baltimore Ravens AFC Divisional playoff game at Sports Authority Field Saturday Jan. 12, 2013.

Baltimore Ravens quarterback Joe Flacco (5) celebrates a touchdown pass with Baltimore Ravens center Matt Birk (77) in the second quarter. The Denver Broncos vs Baltimore Ravens AFC Divisional playoff game at Sports Authority Field Saturday Jan. 12, 2013.

Denver Broncos quarterback Peyton Manning (18) shakes hands with Baltimore Ravens quarterback Joe Flacco (5) after the Ravens kicked a game-winning field goal in overtime. The Denver Broncos vs Baltimore Ravens AFC Divisional playoff game at Sports Authority Field Saturday Jan. 12, 2013.

Joe Flacco (5) gestures towards Anquan Boldin (81) against the San Francisco 49ers during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana.

Joe Flacco #5 of the Baltimore Ravens attempts to escape a pass rush by Ahmad Brooks #55 of the San Francisco 49ers during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana. The Ravens won 34-31.

(L-R) Jacoby Jones #12 and Joe Flacco #5 of the Baltimore Ravens celebrate after Jones caught a 56-yard touchdown pass from Flacco in the second quarter against the San Francisco 49ers during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana.

Joe Flacco #5 of the Baltimore Ravens celebreates with his teammates after defeating the San Francisco 49ers during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana. The Ravens defeated the 49ers 34-31.

Joe Flacco #5 of the Baltimore Ravens holds up the Vince Lombardi Trophy next to CBS host Jim Nantz following their 34-31 win against the Baltimore Ravens during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana.

Super Bowl MVP Joe Flacco #5 of the Baltimore Ravens and his wife Dana walk off of the field after the Ravens won 34-31 against the San Francisco 49ers during Super Bowl XLVII at the Mercedes-Benz Superdome on Feb. 3, 2013 in New Orleans, Louisiana.

In this handout photo provided by Disney Parks, Super Bowl XLVII MVP Joe Flacco rides with Mickey Mouse in a parade through the Magic Kingdom at Walt Disney World Resort Feb. 4, 2013 in Lake Buena Vista, Florida. Flacco led his Baltimore Ravens to a 34-31 win over the San Francisco 49ers last night in New Orleans. After the game, Flacco starred in a commercial where he proclaimed "I'm Going to Disney World!"

Quarterback Joe Flacco #5 of the Baltimore Ravens celebrates with his teammates as they celebrate during their Super Bowl XLVII victory parade on Feb. 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers.

The NFL promotes both teams for its Annual Kickoff Game- the league put up signage of both the Ravens and Broncos around Sports Authority Field at Mile High and downtown Denver, August 27, 2013.

Baltimore Ravens quarterback Joe Flacco (5) sits on the sidelines in the third quarter. The Denver Broncos took on the Baltimore Ravens in the first game of the 2013 season at Sports Authority Field at Mile High in Denver on Sept. 5, 2013.

Joe Flacco (5) of the Baltimore Ravens hands off to Justin Forsett (29) of the Baltimore Ravens in the second quarter. The Denver Broncos played the Baltimore Ravens at Sports Authority Field at Mile High in Denver, CO on Sept. 13, 2015.

Von Miller (58) of the Denver Broncos pressures Joe Flacco (5) of the Baltimore Ravens. The Denver Broncos played the Baltimore Ravens at Sports Authority Field at Mile High in Denver, CO on Sept. 13, 2015.

Quarterbacks Joe Flacco #5 of the Baltimore Ravens and Case Keenum #7 of the Minnesota Vikings greet each other after the game on Oct. 22, 2017 at U.S. Bank Stadium in Minneapolis, Minnesota. The Vikings defeated the Ravens by a score of 24-16.

Quarterback Joe Flacco #5 of the Baltimore Ravens runs with the ball in the second quarter against the Houston Texans at M&T Bank Stadium on Nov. 27, 2017 in Baltimore, Maryland.

Quarterback Joe Flacco of the Baltimore Ravens walks off the field after a 23-16 win over the Houston Texans at M&T Bank Stadium on Nov. 27, 2017 in Baltimore, Md.

Quarterback Joe Flacco #5 of the Baltimore Ravens huddles with the offense in the first quarter against the Detroit Lions at M&T Bank Stadium on Dec. 3, 2017 in Baltimore, Maryland.

Quarterback Joe Flacco #5 and offensive guard James Hurst #74 of the Baltimore Ravens celebrate after a touchdown in the fourth quarter against the Indianapolis Colts at M&T Bank Stadium on Dec. 23, 2017 in Baltimore, Maryland.

Quarterback Joe Flacco (5) of the Baltimore Ravens looks on against the Buffalo Bills at M&T Bank Stadium on Sept. 9, 2018 in Baltimore, Maryland.

Denver Broncos linebacker Bradley Chubb #55 looking down Baltimore Ravens quarterback Joe Flacco #5 at M&T Bank Stadium on Sept. 23, 2018 in Baltimore, MD.

Joe Flacco #5 of the Baltimore Ravens celebrates after a touchdown run by Javorius Allen in the third quarter of the game against the Denver Broncos at M&T Bank Stadium on Sept. 23, 2018 in Baltimore, Maryland. The Ravens won 27-14.

Joe Flacco #5 of the Baltimore Ravens pitches to Alex Collins #34 as Derek Wolfe #95 of the Denver Broncos pursues during the second half at M&T Bank Stadium on Sept. 23, 2018 in Baltimore, Maryland.

Joe Flacco #5 of the Baltimore Ravens hands a ball to a fan as he leaves the field after a 26-14 win over the Pittsburgh Steelers at Heinz Field on Sept. 30, 2018 in Pittsburgh, Pennsylvania.