The Houston Astros placed third baseman Alex Bregman on the 10-day injured list Thursday with a left quad strain.
Bregman left Wednesday's game, an 8-4 win over the Texas Rangers, after pulling up while running to first base in the first inning.
Astros manager Dusty Baker said "we really don't know" how long Bregman will be out.
"He's being evaluated by doctors today," Baker said, per MLB.com. "Even when they do tell us, to tell you how long it's going to be, it's merely a guess."
Bregman, 27, is batting .275 with seven home runs and 34 RBIs through 59 games this season. He is a two-time All-Star, was one of Houston's key contributors in its run to the 2017 World Series and finished fifth in the American League MVP voting in 2018.
The Astros called up catcher Garrett Stubbs from Triple-A Sugar Land to fill Bregman's place on the active roster.
Stubbs, 28, has appeared in 38 games over three seasons with Houston, including five this year. He is a lifetime .190 hitter with three doubles and four RBIs.
--Field Level Media