Seattle Seahawks' Richard Sherman carries the ball in the second half of a preseason NFL football game against the Oakland Raiders in Seattle on Sept. 2, 2011.

Cleveland Browns tight end Evan Moore (89) is upended by Seattle Seahawks defensive back Richard Sherman after a catch in the second quarter of an NFL football game Sunday, Oct. 23, 2011, in Cleveland.

Seattle Seahawks' Richard Sherman, left, intercepts a pass meant for Washington Redskins' Santana Moss as Seahawks' Kam Chancellor follows in the second half of an NFL football game, Sunday, Nov. 27, 2011, in Seattle.

Seattle Seahawks cornerback Richard Sherman during warm ups before the NFL football game against the St. Louis Rams, Monday, Dec. 12, 2011, in Seattle.

Seattle Seahawks cornerback Richard Sherman (25) celebrates his interception against the Chicago Bears with teammate Brandon Browner (39) in the second half of an NFL football game in Chicago, Sunday, Dec. 18, 2011. The Seahawks won 38-14.

Seattle Seahawks Richard Sherman runs off the field after the Seahawks beat the San Francisco 49ers 42-13 in an NFL football game, Sunday, Dec. 23, 2012, in Seattle.

Seattle Seahawks head coach Pete Carroll celebrates an interception by cornerback Richard Sherman (25) with Sherman and Doug Baldwin (15) in the second half of an NFL football game in Chicago, Sunday, Dec. 18, 2011. The Seahawks won 38-14.

Seattle Seahawks' Richard Sherman throws out the ceremonial first pitch before a baseball game between the Texas Rangers and Seattle Mariners Thursday, April 11, 2013, in Seattle.

Seattle Seahawks cornerback Richard Sherman (25) returns an interception from Arizona Cardinals quarterback John Skelton for a 19-yard touchdown during the second quarter of an NFL football game in Seattle, Sunday, Dec. 9, 2012.

Seattle Seahawks' Richard Sherman tips a pass intended for San Francisco 49ers' Michael Crabtree (15) in the final seconds of the second half of the NFL football NFC Championship game Sunday, Jan. 19, 2014, in Seattle. Malcolm Smith intercepted the tipped pass. The Seahawks won 23-17 to advance to Super Bowl XLVIII.

Seattle Seahawks' Richard Sherman reacts after tipping a pass intended for San Francisco 49ers' Michael Crabtree (15) in the final seconds of the second half of the NFL football NFC Championship game Sunday, Jan. 19, 2014, in Seattle. Malcolm Smith intercepted the tipped pass. The Seahawks won 23-17 to advance to Super Bowl XLVIII.

Seattle Seahawks' Richard Sherman (25) knocks the ball away from New York Jets' Chaz Schilens (85) as Seahawks' Marcus Trufant (23) collides with Jets' Jeremy Kerley during the second half of an NFL football game, Sunday, Nov. 11, 2012, in Seattle. The Seahawks won 28-7.

Seattle Seahawks' Richard Sherman (25) talks with New England Patriots quarterback Tom Brady after an NFL football game, Sunday, Oct. 14, 2012, in Seattle. The Seahawks won 24-23.

Seattle Seahawks cornerback Richard Sherman (25) during an NFL game against the Arizona Cardinals on Thursday, Oct. 17, 2013 in Glendale, Ariz. The Seahawks won the game, 34-22.

Seattle Seahawks Richard Sherman (25) comes up with the football as Seahawks' Earl Thomas (29) celebrates after Sherman intercepted an Arizona Cardinals pass in the second half of an NFL football game, Sunday, Dec. 22, 2013, in Seattle.

Seattle Seahawks' Richard Sherman (25) takes the field during player introductions before an NFL football game against the New Orleans Saints, Monday, Dec. 2, 2013, in Seattle.

Seattle Seahawks' Richard Sherman celebrates after the Seahawks score a safety in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 15, 2013, in Seattle.

Chicago Bears wide receiver Brandon Marshall (15) is guarded by Seattle Seahawks cornerback Richard Sherman (25) in the first half of an NFL football game in Chicago, Sunday, Dec. 2, 2012.

Seattle Seahawks' Richard Sherman holds up the George Halas Trophy after the NFL football NFC Championship game against the San Francisco 49ers Sunday, Jan. 19, 2014, in Seattle. The Seahawks won 23-17 to advance to Super Bowl XLVIII.

Seattle Seahawks cornerback Richard Sherman (25) goes up for a ball during the first half of an NFC divisional playoff NFL football game against the Atlanta Falcons Sunday, Jan. 13, 2013, in Atlanta.

Seattle Seahawks' Richard Sherman celebrates with fans after after the NFL football NFC Championship game against the San Francisco 49ers Sunday, Jan. 19, 2014, in Seattle. The Seahawks won 23-17 to advance to Super Bowl XLVIII.

Houston Texans wide receiver Andre Johnson (80) is tripped up by Seattle Seahawks cornerback Richard Sherman (25) during an NFL football game at Reliant Stadium on Sunday September 29, 2013 in Houston, Texas. Seattle won 23-20.

Seattle Seahawks cornerback Richard Sherman (25) during an NFL game against the San Francisco 49ers on Sunday, Sep. 15, 2013 in Seattle. The Seahawks won the game, 29-3.

Seattle Seahawks cornerback Richard Sherman (25) walks onto the field with safety Kam Chancellor (31) and defensive back DeShawn Shead (35) prior to an NFL football game against the Los Angeles Rams at the Los Angeles Memorial Coliseum, Sunday, Sept. 18, 2016, in Los Angeles.

Seattle Seahawks cornerback Richard Sherman (25) runs onto the field from the tunnel prior to an NFL football game against the Carolina Panthers on Sunday, Dec. 4, 2016, in Seattle. Seattle won 40-7.

Seattle Seahawks cornerback Richard Sherman (25) and other players cheer in huddle before the first half of an NFL football NFC divisional playoff game between the Atlanta Falcons and the Seattle Seahawks, Saturday, Jan. 14, 2017, in Atlanta.

Seattle Seahawks cornerback Richard Sherman (25) talks to side judge Alex Kemp (55) during an NFL football game against the New Orleans Saints on Sunday, Oct. 30, 2016, in New Orleans. New Orleans won 25-20.

Seattle Seahawks defensive back Richard Sherman (25) pumps up the crowd during an NFC Wild Card game against the Detroit Lions on Saturday, Jan. 7, 2017, in Seattle, Wash. The Seahawks won the game, 26-6.

Seattle Seahawks cornerback Richard Sherman (25) prior to an NFL preseason football game against the Kansas City Chiefs, Friday, Aug. 25, 2017, in Seattle. The Seahawks defeated the Chiefs, 26-13.

Seattle Seahawks cornerback Richard Sherman, left, celebrates with Seahawks wide receiver Doug Baldwin (89) after Baldwin's third touchdown reception, in the second half an NFL football game against the Baltimore Ravens, Sunday, Dec. 13, 2015, in Baltimore.

Seattle Seahawks cornerback Richard Sherman (25) carries a turkey off the field after the Seahawks beat the San Francisco 49ers 19-3 in an NFL football game in Santa Clara, Calif., Thursday, Nov. 27, 2014.

Seattle Seahawks cornerback Richard Sherman (25) is seen prior to an NFL football game against the Washington Redskins, Sunday, Nov. 5, 2017, in Seattle. The Redskins defeated the Seahawks, 17-14.

Seattle Seahawks' Richard Sherman (25) intercepts a pass in front of Green Bay Packers' Davante Adams (17) during the first half of the NFL football NFC Championship game Sunday, Jan. 18, 2015, in Seattle.

Seattle Seahawks free safety Earl Thomas (29) and cornerback Richard Sherman (25) celebrates outside linebacker Malcolm Smith's (53) interception during the NFL football NFC Championship game against the San Francisco 49ers, Sunday, January 19, 2014, in Seattle. Smith's interception sealed the win for the Seahawks as they they defeated the San Francisco 49ers to advance to Super Bowl XLVIII.

Seattle Seahawks cornerback Richard Sherman (25) stretches before an NFL football game against the Carolina Panthers, Sunday, Dec. 4, 2016, in Seattle. The Seahawks defeated the Panthers, 40-7.

New England Patriots quarterback Tom Brady (12) and Seattle Seahawks cornerback Richard Sherman (25) during an NFL football game, Sunday, Nov. 13, 2016, in Foxborough, Mass. The Seahawks defeated the Patriots, 31-24.

Seattle Seahawks players huddle prior to an NFL football game against the Arizona Cardinals, Thursday, Nov. 9, 2017, in Glendale, Ariz. The Seahawks defeated the Cardinals, 22-16.

Seattle Seahawks cornerback Richard Sherman (25) takes to the field during an NFL regular season football game against the Carolina Panthers on Sunday, Oct. 18, 2015 in Seattle. The Panthers won, 27-23.