New England Patriots tight end Rob Gronkowski (87) runs with quarterback Tom Brady's, far left, recovered Super Bowl jersey as they joke around during Boston Red Sox home opening day ceremonies at Fenway Park, Monday, April 3, 2017, in Boston. The Red Sox face the Pittsburgh Pirates in the baseball game. (AP Photo/Elise Amendola)

New England Patriots tight end Rob Gronkowski (87) completes a reception and runs for 34 yards stretching to the 2 yard line during the 2016 NFL week 5 regular season football game against the Cleveland Browns on Sunday, Oct. 9, 2016 in Cleveland. The Patriots defeated the Browns 33-13. (Jim Mahoney via AP)

New England Patriots tight end Rob Gronkowski yells to the crowd during a rally Tuesday, Feb. 7, 2017, in Boston to celebrate Sunday's 34-28 win over the Atlanta Falcons in the NFL Super Bowl 51 football game in Houston. (AP Photo/Elise Amendola)

New England Patriots tight end Rob Gronkowski (87) takes a pass from quarterback Tom Brady behind Pittsburgh Steelers strong safety Robert Golden (21) for a touchdown during the second half of an NFL football game in Pittsburgh, Sunday, Oct. 23, 2016. (AP Photo/Jared Wickerham)

New England Patriots tight end Rob Gronkowski (87) celebrates after winning the NFL Super Bowl LI football game against the Atlanta Falcons at NRG Stadium on Sunday, February 5, 2017 in Houston, TX. (Ben Liebenberg/NFL)

New England Patriots tight end Rob Gronkowski holds up Vince Lombardi Trophy after the Patriots defeated the Seattle Seahawks 28-24 in NFL Super Bowl XLIX football game Sunday, Feb. 1, 2015, in Glendale, Ariz. (AP Photo/Mark Humphrey)

New England Patriots tight end Rob Gronkowski (87), center, runs with the ball as Denver Broncos outside linebacker Brandon Marshall (54), left, pursues in the first half of an NFL football game on Sunday, Nov. 2, 2014, in Foxborough, Mass. (AP Photo/Steven Senne)

New England Patriots tight end Rob Gronkowski (87) carries Chicago Bears defensive back Al Louis-Jean (39) into the end zone while scoring a touchdown in the second half of an NFL football game on Sunday, Oct. 26, 2014, in Foxborough, Mass. (AP Photo/Steven Senne)

New England Patriots tight end Rob Gronkowski reacts after failing to make a catch in the end zone in the second half of an NFL football game against the Oakland Raiders Sunday, Sept. 21, 2014, in Foxborough, Mass. (AP Photo/Elise Amendola)

New England Patriots tight end Rob GronKowski (87) catching the football and scoring a touchdown in the third quarter during the NFL AFC Championship game between the Indianapolis Colts and the New England Patriots on Sunday, January 18, 2015 at Gillette Stadium, Foxborough, Massachusetts. The Patriots beat the Colts 45-7. (AP Images /David Drapkin).

New England Patriots quarterback Tom Brady, top, jumps on the back of tight end Rob Gronkowski after Gronkowski scored a touchdown against the Indianapolis Colts during the second half of an NFL football game in Indianapolis, Sunday, Nov. 16, 2014. (AP Photo/AJ Mast)

February 4, 2015: Rob Gronkowski poses with a sign a fan made poking fun at the story "A Gronking To Remember". The New England Patriots paraded through the streets of Boston to celebrate their Super Bowl victory. (Icon Sportswire via AP Images)

New England Patriots tight end Rob Gronkowski (87) scores a touchdown as New York Jets' Calvin Pryor (25) tackles him during the first half of an NFL football game Sunday, Dec. 21, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

New England Patriots tight end Rob Gronkowski (87) hauls in a touchdown pass against New York Jets free safety LaRon Landry (30) in the first quarter of an NFL football game in Foxborough, Mass., Sunday, Oct. 21, 2012. (AP Photo/Charles Krupa)

New England Patriots tight end Rob Gronkowski (87) catches a 10-yard touchdown pass while being defended by Denver Broncos cornerback Andre' Goodman (21) during the first half of an NFL divisional playoff football game Saturday, Jan. 14, 2012, in Foxborough, Mass. (AP Photo/Charles Krupa)

New England Patriots Rob Gronkowski in action against the Seattle Seahawks in the second half of an NFL football game, Sunday, Oct. 14, 2012, in Seattle. (AP Photo/Elaine Thompson)

New England Patriots tight end Rob Gronkowski (87) catches a touchdown pass in front of Seattle Seahawks outside linebacker K.J. Wright during the first half of NFL Super Bowl XLIX football game Sunday, Feb. 1, 2015, in Glendale, Ariz. (AP Photo/Michael Conroy)

New England Patriots tight end Rob Gronkowski (87) spikes the ball after scoring a touchdown during an NFL football game against the Houston Texans at Reliant Stadium on Sunday December 1, 2013 in Houston, Texas. New England won 34-31. (Aaron M. Sprecher/NFL)

New England Patriots tight end Rob Gronkowski (87) scores a touchdown as New York Jets' Calvin Pryor (25) tackles him during the first half of an NFL football game Sunday, Dec. 21, 2014, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Denver Broncos linebacker Wesley Woodyard (52) tackles New England Patriots tight end Rob Gronkowski (87) after a catch in the second quarter of an NFL football game, Sunday, Oct. 7, 2012, in Foxborough, Mass. (AP Photo/Steven Senne)

New England Patriots tight end Rob Gronkowski (87) falls to the turf as Carolina Panthers cornerback Melvin White (23) defends during the first half of an NFL football game in Charlotte, N.C., Monday, Nov. 18, 2013. (AP Photo/Bob Leverone)

New England Patriots tight end Rob Gronkowski celebrates his touchdown catch against the Cincinnati Bengals in the second half of an NFL football game Sunday, Oct. 5, 2014, in Foxborough, Mass. (AP Photo/Stephan Savoia)

New England Patriots tight end Rob Gronkowski (87) heads into the end zone after catching a 13-yard pass for a touchdown during the fourth quarter of an NFL football game against the Kansas City Chiefs Monday, Sept. 29, 2014, in Kansas City, Mo. (AP Photo/Charlie Riedel)

New England Patriots tight end Rob Gronkowski spikes a hockey puck at center ice before an NHL hockey game between the Boston Bruins and the New York Islanders in Boston Saturday, Feb. 7, 2015. (AP Photo/Winslow Townson)

New England Patriots tight end Rob Gronkowski, left, runs away from Washington Redskins strong safety DeJon Gomes (24) and free safety Reed Doughty (37) during the first half of an NFL football game on Sunday, Dec. 11, 2011, in Landover, Md. (AP Photo/Rich Lipski)

New England Patriots tight end Rob Gronkowski (87) celebrates his touchdown reception in front of wide receiver Brandon Tate (19) in the first quarter of an NFL football game against the Miami Dolphins in Foxborough, Mass., Sunday, Jan. 2, 2011. (AP Photo/Michael Dwyer)

New England Patriots tight end Rob Gronkowski (87) spikes the ball after his touchdown catch against the Indianapolis Colts in the first quarter of an NFL football game at Gillette Stadium in Foxborough, Mass., Sunday, Nov. 18, 2012. (AP Photo/Michael Dwyer)

New England Patriots TE Rob Gronkowski poses for a portrait at the National Football League studio in Culver City, Ca., on Thursday, Mar. 29, 2012. (Ben Liebenberg/NFL)

New England Patriots tight end Rob Gronkowski answers a question during Media Day for NFL football's Super Bowl XLVI Tuesday, Jan. 31, 2012, in Indianapolis. (AP Photo/Mark Humphrey)

New England Patriots tight end Rob Gronkowski, left, gets past Buffalo Bills cornerback Leodis McKelvin for a touchdown during the first half of an NFL football game in Orchard Park, N.Y., on Sunday, Dec. 26, 2010. New England won 34-3. (AP Photo/Don Heupel)

New England Patriots tight end Rob Gronkowski (87) turns up field as Pittsburgh Steelers linebacker James Farrior (51) closes in during an NFL football game in Pittsburgh, Sunday, Nov. 14, 2010. The Patriots won 39-26. (AP Photo/Tom E. Puskar)

New England Patriots rookie tight end Rob Gronkowski grabs his first NFL touchdown catch, next to Cincinnati Bengals linebacker Dhani Jones, during the second half of New England's 38-24 win in an NFL football game in Foxborough, Mass., Sunday, Sept. 12, 2010. (AP Photo/Winslow Townson)

New England Patriots tight end Rob Gronkowski (87) catches a touchdown reception in front of Atlanta Falcons linebacker Spencer Adkins (59) during an NFL preseason football game, Thursday, August 19, 2010. The Patriots won the game, 21-10. (AP Photo/Paul Abell)

Rob Gronkowski stands with Commissioner Roger Goodell after being selected by the New England Patriots during the 2010 NFL Draft at Radio City Music Hall in New York City, NY on Apr. 23, 2010. (Ben Liebenberg/NFL)

Arizona's Rob Gronkowski (48) runs for a touchdown past California's Anthony Felder during the second half of an NCAA college football game in Arizona Stadium in Tucson, Ariz., Saturday, Oct. 18, 2008. Arizona won 42-27. (AP Photo/John Miller)

Arizona's Rob Gronkowski runs for a touchdown against Washington in the first half of a football game Saturday, Oct. 27, 2007, in Seattle. (AP Photo/Elaine Thompson)