Pittsburgh Pirates rookie outfielder Esmerlyn Valdez has been placed on the 10-day injured list after he suffered a hamstring injury running to first base in Friday's game.
While trying to run out a ground ball in the sixth inning of a 12-2 loss to the Chicago Cubs, Valdez grabbed the back of his left leg. He limped off the field with his arms draped around the shoulders of training staff after shortstop Nico Hoerner threw him out.
Manager Don Kelly told reporters Saturday that he still wasn't sure of the severity of the injury but that it was bad enough to warrant the IL move.
Outfielder Ronny Simon was recalled from Triple-A Indianapolis in a corresponding move.
Valdez is batting .232 with 17 homers and 47 RBIs in 72 games. The 22-year-old made his major league debut May 22 at Toronto.
Simon has been called up twice previously by the Pirates since August and has gone 9-for-32 with two RBIs over 10 games.
Information from The Associated Press was used in this report.