Cubs pitcher John Lackey

Cubs starting pitcher John Lackey warms up in the dugout before the start of a game against the Diamondbacks on Aug. 11, 2017, in Phoenix.

Cubs starting pitcher John Lackey leaves Wrigley Field dressed in an “Easy Rider”-themed outfit after the Cubs lost to the Nationals at Wrigley Field on Sunday, Aug. 6, 2017.

Cubs starting pitcher John Lackey enters Wrigley Field before the Cubs played the Nationals on Sunday, Aug. 6, 2017.

Cubs starting pitcher John Lackey delivers to the Brewers in the second inning Sunday, July 30, 2017, at Miller Park in Milwaukee.

Cubs starting pitcher John Lackey prepares to face the Brewers on Sunday, July 30, 2017, at Miller Park in Milwaukee.

Cubs starting pitcher John Lackey reacts as White Sox starting pitcher Carlos Rodon hits a two-run double in the second inning Tuesday, July 25, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey signs autographs before the game against the White Sox on Monday, July 24, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey reacts after allowing an RBI double to Tampa Bay Rays left fielder Corey Dickerson on July 5, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey reacts after allowing an RBI double to Tampa Bay Rays left fielder Corey Dickerson on July 5, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey fouls off a pitch on his way to striking out against the Tampa Bay Rays on July 5, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey delivers to the Phillies in the first inning Thursday, May 4, 2017, at Wrigley Field.

Cubs starting pitcher John Lackey on the mound in the first inning of a game at Wrigley Field in Chicago on Wednesday, April 12, 2017.

Cubs catcher Willson Contreras stands between starting pitcher John Lackey and home plate umpire Greg Gibson as Lackey and Gibson have words in the first inning against the Dodgers at Wrigley Field in Chicago on Wednesday, April 12, 2017.

Cubs pitcher John Lackey reacts to a call by the umpire during the first inning against the Cardinals on Thursday, April 6, 2017, in St. Louis.

John Lackey warms up prior to a spring training game against the Indians on Friday, March 24, 2017, in Mesa, Ariz.

John Lackey practices fielding during spring training at the Under Armour Performance Center on Feb. 16, 2017, in Mesa, Ariz.

Miguel Montero, right, congratulates pitcher John Lackey after a spring training workout on Feb. 14, 2017, in Mesa, Ariz.

John Lackey poses during Cubs’ photo day on Feb. 21, 2017, in Mesa, Ariz.

Cubs pitcher John Lackey greets fans at the Cubs Convention in Chicago on Friday, Jan. 13, 2017.

John Lackey, center, hugs former Cubs pitcher Ryan Dempster at the conclusion of the World Series rally in Chicago on Friday, Nov. 4, 2016.

John Lackey celebrates during the Cubs’ World Series victory parade on Nov. 4, 2016, in Chicago.

Jon Lester, left, and John Lackey celebrate after the Cubs won the World Series over the Indians at Progressive Field in Cleveland in the early hours of Nov. 3, 2016.

John Lackey works to a full count against Indians catcher Roberto Perez in the second inning Saturday, Oct. 29, 2016, in Game 4 of the World Series at Wrigley Field.

John Lackey pitches in the first inning Saturday, Oct. 29, 2016, in Game 4 of the World Series at Wrigley Field.

David Ross, left, and John Lackey congratulate each other following Game 6 of the NLCS at Wrigley Field on Saturday, Oct. 22, 2016.

John Lackey celebrates with teammates Wednesday, Oct. 19, 2016, in Game 4 of the National League Championship Series at Dodger Stadium in Los Angeles.

Starting pitcher John Lackey delivers a pitch against the Cincinnati Reds, during the first inning of their game at Wrigley Field on Sept. 21, 2016.

Starting pitcher John Lackey celebrates with his teammates as the Chicago Cubs celebrate their National League Central division title at Wrigley Field on September 16, 2016.

Starting pitcher John Lackey celebrates their National League Central division title Sept. 16, 2016 at Wrigley Field.

Starting pitcher John Lackey reacts as he struggles through the second inning against the St. Louis Cardinals on June 20, 2016 at Wrigley Field.

Starting pitcher John Lackey yells to himself after pitching the fifth inning against the San Francisco Giants at Wrigley Field Sept. 4, 2016.

Starting pitcher John Lackey works the bar during a country-themed fundraiser at Joe’s Bar on Weed Street at 940 W. Weed St., in Chicago, on Jul 6, 2016.

Starting pitcher John Lackey and catcher Willson Contreras after they talked on the mound, during the seventh inning of their game, against the St. Louis Cardinals, at Wrigley Field on Aug. 14, 2016.

Starting pitcher John Lackey prepares for the game July 17, 2016 at Wrigley Field.

Starting pitcher John Lackey delivers a pitch against St. Louis Cardinals starting pitcher Mike Leake, during the third inning of their game, at Wrigley Field on Aug. 14, 2016.

John Lackey, Jon Lester, Jorge Soler and Javier Baez walk to the team bus dressed in onesies after their game against the Los Angeles Dodgers at Dodger Stadium.

Starting pitcher John Lackey stands on the mound as Milwaukee Brewers second baseman Scooter Gennett rounds the bases after hitting a two-run homer in the seventh inning of a game at Wrigley Field on September 16, 2016.

Starting pitcher John Lackey stands for the National Anthem prior to an MLB game between the Chicago Cubs and the Washington Nationals May 6, 2016 at Wrigley Field.

Starting pitcher John Lackey pitches during the first inning of the Chicago Cubs versus Philadelphia Phillies game at Wrigley Field May 29, 2016.

Starting pitcher John Lackey heads to the team bus after a 3-2 loss to the Arizona Diamondbacks at Wrigley Field June 5, 2016.

Starting pitchers John Lackey and Jon Lester share a moment with McKai Malooley, 10 months, as Lackey and Lester bartend at the Anthony Rizzo Family Foundation’s fourth annual Cook-Off for Cancer fundraiser at Morgan Manufacturing in Chicago on Thursday, June 2, 2016.

Manager Joe Maddon talks with starting pitcher John Lackey after Lackey finished the sixth inning of a game against the Milwaukee Brewers at Miller Park on May 18, 2016.

Relief pitcher Travis Wood and starting pitcher John Lackey, heading for the bus after the game against the Atlanta Braves, at Wrigley Field on May 1, 2016.

Pitcher John Lackey stands on stage with other members of the baseball club during the annual Bricks and Ivy Ball charity event at Navy Pier’s Grand Ballroom April 28, 2016.

Cubs starting pitcher John Lackey pitches against the Cardinals at Busch Stadium on April 18, 2016.

John Lackey hits an RBI single against the Cardinals in the seventh inning at Busch Stadium on April 18, 2016 .

Cubs starting pitcher John Lackey yells out in the first inning of a game against the Reds at Wrigley Field on April 13, 2016.

John Lackey is congratulated after shutting down the Reds in the sixth inning at Wrigley Field on Wednesday, April 13, 2016.

John Lackey watches from the dugout after giving up three runs in the first inning against the Diamondbacks on Thursday, April. 7, 2016, in Phoenix.

John Lackey throws during a spring training game against the Kansas City Royals, March 16, 2016.

John Lackey throws against the San Francisco Giants during the first inning of a spring training game, March 26, 2016.

John Lackey poses for a portrait during photo day at spring training, Feb. 29, 2016.

John Lackey practices pitching during the fourth day of spring training at Sloan Park on Monday, Feb. 22, 2016, in Mesa, Ariz.

New Cubs pitcher John Lackey practices with other players during the first workout of spring training.

Cubs pitchers Jon Lester talks and John Lackey during the first day of spring training at Sloan Park.

John Lackey, who recently signed a two-year contract with the Cubs, talks with members of the press during day one of the Cubs Convention.

Jason Heyward (right) uses the jersey of John Lackey to show a confused fan that the duo now plays for the Cubs during the annual Cubs Convention,

Pitcher John Lackey greets fans during the opening ceremony of the 2016 Cubs Convention.

Pitcher John Lackey greets fans during the opening ceremony of the 2016 Cubs Convention.

John Lackey of the St. Louis Cardinals throws a pitch against the Cubs during Game 1 of the 2015 National League Division Series.

Cubs third baseman Kris Bryant fouls off a pitch from St. Louis Cardinals starting pitcher John Lackey in Game 4 of the 2015 NLDS at Wrigley Field.

St. Louis Cardinals starting pitcher John Lackey delivers to the Cubs in Game 1 of the 2015 National League Division Series.

John Lackey of the St. Louis Cardinals throws a pitch against the Cubs during Game 4 of the 2015 National League Division Series.

St. Louis Cardinals’ John Lackey hits a single with a broken bat during the second inning of Game 4 of the 2015 NLDS.

St. Louis Cardinals starting pitcher John Lackey reacts after striking out Cubs center fielder Dexter Fowler during Game 4 of the 2015 National League Division Series.

St. Louis Cardinals pitcher John Lackey throws during practice before the 2015 playoffs.

John Lackey of the St. Louis Cardinals looks on between pitches against the Cubs during Game 1 of the 2015 National League Division Series.

St. Louis Cardinals starting pitcher John Lackey acknowledges the crowd after being taken out during Game 1 of the 2015 National League Division Series against the Cubs.

John Lackey of the St. Louis Cardinals throws a pitch against the Cubs during Game 4 of the 2015 National League Division Series at Wrigley Field.

John Lackey watches batting practice before a game with Blue Jays at Fenway Park.

Red Sox’s John Lackey pitches against the Angels.