CHICAGO -- The Chicago Cubs have placed right fielder Jason Heyward on the seven-day concussion disabled list and recalled right-hander Jen-Ho Tseng from Triple-A Iowa to start Tuesday's game against the Miami Marlins.
Heyward, a five-time Gold Glove winner, banged his head against the right-field wall trying to rob Dexter Fowler of a game-ending homer at St. Louis on Sunday. Heyward sat out Monday's 14-2 win over Miami.
"I guess he popped it on that fly ball the other day in St. Louis on the home run by Dexter," manager Joe Maddon said. "I think he bumped his head. So we just got a whole bunch of little things going on, little brushfires.
"I talked to him in the dugout and I could tell that things were just off a little bit."
Tseng is filling in with Yu Darvish on the 10-day disabled list because of the flu. He is 0-4 with an 8.04 ERA in six starts for Iowa.
The Cubs held second baseman Javier Baez (tight groin) out of the lineup. They also recalled infielder David Bote and left-hander Rob Zastryzny while optioning right-hander Cory Mazzoni to Iowa.
Information from ESPN's Jesse Rogers and The Associated Press was used in this report.
Cubs place Jason Heyward on 7-day concussion DL; recall Jen-Ho Tseng