The Cubs placed Jason Heyward on the seven-day concussion injured list Tuesday following the outfielder's scary collision running the bases over the weekend.
Giants shortstop Brandon Crawford's knee struck Heyward's head as Heyward slid into third base Saturday.
"That was a tough collision," Cubs bench coach Andy Green said. "It’s two strong guys running into each other pretty hard there. Took a knee to the head. Definitely got his bell rung."
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Heyward was going from first to third base on a groundball hit to the shortstop hole. Crawford's throw to first base was late, and he ran to cover a vacated third base.
Crawford received a return throw from Giants first baseman Brandon Belt, colliding with Heyward as he caught the ball and attempted to hurdle him.
Heyward's IL stint is retroactive to Sunday. He did not play Sunday as the Cubs continued to monitor him.
The Cubs called up outfielder Trayce Thompson from Triple-A Iowa in a corresponding move, transferring outfielder Michael Hermosillo to the 60-day IL to make room on the 40-man roster.
MLB
Hermosillo is out for the season with a forearm strain.
Thompson is hitting .233/.344/.492 with 21 home runs and 63 RBIs in 88 games with Iowa this season.
The 2009 second-round pick by the White Sox has 202 games of big-league experience with the Sox, Dodgers and A's.
He and Golden State Warriors guard Klay Thompson are brothers.