Pittsburgh Steelers outside linebacker James Harrison (92) is introduced before an NFL football game against the Cincinnati Bengals, Sunday, Dec. 28, 2014 in Pittsburgh.

AFC teammates James Harrison, left, of the Pittsburgh Steelers, and Josh Cribbs, of the Cleveland Browns, pose before the start of the Pro Bowl football game in Honolulu, Sunday, Feb. 10, 2008. Both Harrison and Cribbs are former Kent State players.

FILE - In this Feb. 1, 2009, file photo, Pittsburgh Steelers linebacker James Harrison returns an interception for a 100-yard touchdown during the second quarter of the NFL Super Bowl XLIII football game in Tampa, Fla. At right is Arizona Cardinals guard Reggie Wells. Harrison reached terms Monday, April 13, 2009, on a $51.75 million, six-year contract that will make him the second highest-paid player in franchise history.

Pittsburgh Steelers outside linebacker James Harrison (92) hands his gloves to a fan as he heads to the locker room following their 24-10 win over the Cleveland Browns in an NFL football game in Pittsburgh, Sunday, Dec. 30, 2012.

Pittsburgh Steelers linebacker James Harrison (92) holding the Super Bowl Trophy, a cigar and wearing the Super Bowl robe in the locker room after the NFL Super Bowl XLIII football game against the Arizona Cardinals, Sunday Feb. 1, 2009 in Tampa, Fla. The Steelers won 27 to 23.

Pittsburgh Steelers linebacker James Farrior (51), nose tackle Casey Hampton (98) and linebacker James Harrison(92) celebrate by smoking cigars and wearing their Super Bowl robes in the locker room after the NFL Super Bowl XLIII football game against the Arizona Cardinals, Sunday Feb. 1, 2009 in Tampa, Fla. The Steelers won 27 to 23.

Pittsburgh Steelers linebacker James Harrison carries the Vince Lombardi trophy as he leaves the stage after a rally during their Super Bowl victory parade in Pittsburgh, Tuesday, Feb. 3 2009. The Steelers beat the Arizona Cardinals 27-23 in football's Super Bowl XLIII on Feb. 1 in Tampa, Fla.

From left, Pittsburgh Steelers' James Farrior, NFL commissioner Roger Goodell, and Steelers' James Harrison and Troy Polamalu gather after an AFC practice for Sunday's Pro Bowl football game, in Kapolei, Hawaii, Thursday, Feb. 5, 2009.

Pittsburgh Steelers linebacker James Harrison looks to pass while warming up for football practice at the team's training facility in Pittsburgh, Thursday, June 11, 2009.

Pittsburgh Steelers linebacker James Harrison drives a subcompact car as he arrives at their NFL football training camp in Latrobe, Pa., Friday, July 31, 2009.

Pittsburgh Steelers linebacker James Harrison (92) in action against the Cincinnati Bengals during the first quarter of an NFL football game Sunday Nov. 15, 2009 in Pittsburgh. Cincinnati won 18-12.

Linebacker James Harrison #92 of the Pittsburgh Steelers jumps in to action against the Cincinnati Bengals during week ten NFL action on Sunday, November 15, 2009 in Pittsburgh, PA. The Bengals won the game 18-12.

FILE - In this Dec. 27, 2009, file photo, Pittsburgh Steelers linebacker James Harrison (92) rushes against the Baltimore Ravens during an NFL football game in Pittsburgh. Nothing like opening the season at fierce rival Baltimore, With the league toughening its stance on illegal hits, can Harrison fined $100,000 for illegal hits last season play within the rules on a consistent basis

Pittsburgh Steelers linebacker James Harrison (92) of the American Football Conference All-Stars smiles during the 2010 NFL Pro Bowl practice, January 29, 2010 in Fort Lauderdale, Florida.

Pittsburgh Steelers linebacker James Harrison warms up before an NFL football game against the Cincinnati Bengals in Pittsburgh, Sunday, Dec 12, 2010.

Quarterback Joe Flacco #5 of the Baltimore Ravens is sacked for a loss by linebacker James Harrison #92 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 .

Pittsburgh Steelers outside linebacker James Harrison wears sunglasses as he sits on the sidelines in the fourth quarter of the NFL football game between the Steelers and the Tennessee Titans, Sunday, Oct. 9, 2011, in Pittsburgh. Harrison was injured in last week's game against the Houston Texans and had surgery to repair a broken orbital bone. The Steelers won 38-17.

Pittsburgh Steelers outside linebacker James Harrison arrives in a Saint Vincent Fire Department firetruck for NFL football training camp in Latrobe, Pa., Thursday, July 27, 2017 .

FILE - In this Dec. 17, 2017 file photo, Pittsburgh Steelers linebacker James Harrison arrives at Heinz Field for an NFL football game against the New England Patriots in Pittsburgh. The Patriots signed Harrison, Tuesday, Dec. 26, 2017, after he was released on Saturday by the Steelers.

New England Patriots linebacker James Harrison runs during an NFL football team practice Wednesday, Dec. 27, 2017, in Foxborough, Mass. The Patriots signed the 39-year-old, five-time Pro Bowl linebacker after he was released Saturday by the Pittsburgh Steelers. The Patriots host the New York Jets in the final regular season game on Sunday.

Cincinnati Bengals wide receiver A.J. Green (18) fumbles the football as he is hit by Pittsburgh Steelers cornerback Cortez Allen (28) and Pittsburgh Steelers outside linebacker James Harrison (92) during the third quarter of an NFL football game in Pittsburgh, Sunday, Dec 23, 2012. The Steelers' Ryan Clark recovered the fumble.

Pittsburgh Steelers outside linebacker James Harrison (92) is introduced before an NFL football game against the Arizona Cardinals, Sunday, Oct. 18, 2015 in Pittsburgh. The Steelers won 25-13.

Cincinnati Bengals linebacker James Harrison (92) in action on defense during the NFL week 4 football game against the Cleveland Browns on Sunday, Sept. 29, 2013, at FirstEnergy Stadium in Cleveland, Ohio. The Browns won the game 17-6.

FILE - In this Feb. 3, 2009, file photo, Pittsburgh Steelers linebacker James Harrison holds the Vince Lombardi trophy during the NFL football team's Super Bowl victory parade in Pittsburgh. The former Steelers linebacker is officially retiring on Friday, Sept. 5, 2014, ending an 11-year career that included five Pro Bowls, two Super Bowl rings and numerous run ins with the NFL front office.

Pittsburgh Steelers outside linebacker James Harrison (92) stretches during an NFL divisional playoff football game against the Denver Broncos on Sunday, Jan. 17, 2016 in Denver. The Broncos won, 23-16.

Pittsburgh Steelers outside linebacker James Harrison (92) prior to an NFL football game against the Kansas City Chiefs, Sunday, Oct. 15, 2017, in Kansas City, Mo. The Steelers defeated the Chiefs, 19-13.

FILE - In this Feb. 1, 2009, file photo, Pittsburgh Steelers linebacker James Harrison celebrates after returning an interception 100 yards for a touchdown during the second quarter of the NFL Super Bowl XLIII football game against the Arizona Cardinals in Tampa, Fla. The former Steelers linebacker is officially retiring on Friday, Sept. 5, 2014, ending an 11-year career that included five Pro Bowls, two Super Bowl rings and numerous run ins with the NFL front office.

Pittsburgh Steelers outside linebacker James Harrison (92) warms up before an NFL football game against the Oakland Raiders, Sunday, Nov. 8, 2015, in Pittsburgh.

PITTSBURGH, PA - NOVEMBER 20: Defensive end James Harrison #92 of the Pittsburgh Steelers runs in pursuit against the Cincinnati Bengals at Heinz Field on November 20, 2008 in Pittsburgh, Pennsylvania. The Steelers defeated the Bengals 27-10.

Apr 18, 2017; Pittsburgh, PA, USA; Pittsburgh Steelers linebacker James Harrison (L) and receiver Antonio Brown (R) in attendance at the funeral service for Pittsburgh Steelers chairman Daniel Rooney at Saint Paul Cathedral.