Lawrie said his back felt looser Sunday morning, but he could tell he wasn't 100 percent.
"I think they're just taking precaution, this being the last day before the All-Star break. I think they're maybe just giving me one more day to make sure when I do come back, everything's going to be refreshed."
Manager John Farrell said he didn't feel comfortable risking further damage by letting Lawrie play. He said he anticipates that Lawrie will return after the All-Star break, and the third baseman could use the time off.
"Everything points to that being the case," Farrell said. "Other than the four days he missed following the incident back in Toronto, he's played pretty much every inning. He's due for a day off."