Manager David Ross said Heyward is "doing OK" and added "he had some real stuff" that included body aches and hydration issues. Heyward, a five-time Gold Glove winner, is batting .208 with four RBI in 27 games this season.
Stroman has been cleared to return and was scheduled to throw a bullpen session on Tuesday. Ross was optimistic about Stroman's return to the rotation in the next week. The 31-year-old last pitched on May 1, tossing seven shutout innings in Milwaukee to earn his first victory of the season after three losses.
Additionally, Chicago recalled infielder/outfielder Christopher Morel from Double-A Tennessee and optioned left-hander Conner Menez to Iowa on Tuesday. Both Hughes and Morel arrived at Wrigley Field in time from Tuesday night's game against Pittsburgh.