HOUSTON — Yoenis Cespedes was not in the A's lineup as expected Friday night against the Astros in Minute Maid Field.

Cespedes just said that his left hamstring is somewhat improved, but suggested he would need a few days off before he's ready to go again.

"It's a little better today," Cespedes said.

The left fielder came out of Thursday's game against the Astros after feeling the hamstring tighten as he legged out an infield hit.

Manager Bob Melvin said that the A's medical team didn't think the problem was a big one, testament to which was the fact that Cespedes wasn't asked to have an MRI on the hamstring. Melvin said a couple of days' rest should do it and that Cespedes was not a candidate for the disabled list.

"Yoenis is all right; he'll take some batting practice today and we'll see where we are," the manager said. "It's certainly not a DL thing and hopefully it's just day-to-day.''

Brandon Moss took Cespedes' spot in left field Friday with Daric Barton at first base against the Astros.