"You see him grimace, he wasn't moving as well as he normally does," Roberts said. "To come out of a game, I don't think we'll see him play tomorrow night."
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Grandal said he strained both forearms hitting extra from both sides of the plate and suspects it is the result of delaying the start of winter workouts because of his offseason surgery on his left shoulder. He hopes to return to games next week.
Also in Friday's game, Dodgers outfielder Joc Pederson was removed after one inning to fulfill an appointment. He did not have a medical issue.
"[Pederson] had an appointment and wanted to get one at-bat," Roberts said.
Howie Kendrick's sore groin muscle improved enough to allow him to take some at-bats in a Minor League game Friday.
Justin Turner, who is returning cautiously from knee surgery, said he hopes to make his Cactus League debut Monday as a designated hitter.
Hyun-Jin Ryu is throwing from 150 feet and hopes to throw off a mound next week.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.