Headley, a late scratch from Monday's game against the Mariners, said he arrived at the field Tuesday with his back feeling a little tight. He attempted to get loose during morning stretching, but the back did not respond well.
"I don't think it's anything terribly serious by any means. But where we are right now, there's no reason to push it," Headley said. "I think that we will probably take a day or two and let it calm down, and hopefully I'll be back."
Outfielder Chris Denorfia has also been kept from games with a sore back. However, Denorfia is able to take part in morning practice and workouts.
Elsewhere, Jason Bartlett's sore right knee continues to get better, manager Bud Black said. Outfielder Cameron Maybin, who was sent home Monday with the stomach flu, was back in the lineup Tuesday. Catcher John Baker was hit hard by a virus of some sorts. He'll work out with the team Tuesday, but won't likely appear in a game until Wednesday at the earliest.