OAKLAND -- Brandon Moss was held out of the A's lineup Saturday after leaving Friday's series opener against the Angels with right calf tightness.
Manager Bob Melvin said Moss will likely sit out Sunday's game as well, which would give him three days to recover including an off-day Monday.
"He's OK, still day to day," Melvin said before Saturday's game. "I don't want to get ahead of myself. We'll see how he's doing tomorrow."
After hitting his first career grand slam in the first inning Friday, Moss began to experience pain in his right calf prior to the top of the third.
"I was coming onto the field and it just balled up on me, and I couldn't really get the cramp out for the entire inning," Moss said. "It was hurting pretty badly."
Moss entered Saturday with 13 home runs and a team-leading 46 RBIs.
Aaron Leibowitz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.