The move is being done so Schwarber can "clear his head", CSN Chicago's David Kaplan posted on Twitter.
In 2017, he has batted.171 with 12 homers, 28 RBI, and.295 on-base percentage.
The 24-year-old Schwarber was sent down to Class AAA Iowa on Thursday, giving the slumping slugger a chance to catch his breath after a hard start to the season.
"There is no actual timetable", Cubs manager Joe Maddon told reporters in reference to how long Schwarber will be with Iowa. He missed most of last season with a leg injury after a frightening outfield collision, then returned in October to help the Cubs win the World Series for the first time since 1908.
Schwarber played in the Fall Classic last year without having registered a single hit in the regular season, having torn his ACL in the year's third game.More news: Afghan soldier wounds 7 American soldiers
Pitcher Dylan Floro and outfielder Mark Zagunis have been promoted from Class AAA Iowa to take Schwarber and Heyward's spots on the roster.
Heyward is dealing with a cut hand suffered in Sunday's game against the Pittsburgh Pirates.
Kyle Schwarber has struggled to find consistency at the plate since the beginning of the season and a few have even suggested that a few days in the minors could help a lot.
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