Lawrie has been out since straining the oblique area during a game against Oakland on Aug. 3. He was later sent to work out at the club's Minor League complex in Dunedin, Fla., before appearing in a pair of games over the weekend.
Everything seemed to be going as planned until the 22-year-old woke up on Monday morning with increased discomfort. He will be shut down until at least Monday, and manager John Farrell didn't eliminate the possibility that Lawrie might not be able to return at all this season.
"We haven't come to that point in time yet," Farrell said of Lawrie's season coming to an end. "The most important thing is for him to get back to being symptom-free and to progress from there. But we can't rule anything out at this point.
"The most important thing is that he needs additional rest right now. Somewhat of a puzzling thing at this point. [During] BP, the baseball activity leading up to the games in which he played, there were no recurring symptoms, and yet after Sunday's game he woke up Monday feeling the soreness, and as a result we shut him down."
Lawrie went 0-for-4 in his two rehab games before the setback. When he sustained the injury, there was hope that a stint on the disabled list could be avoided, but it became clear in the ensuing days that would not be the case.
The native of Langley, British Columbia, has been forthright about his condition -- a welcome change, as players are normally tight-lipped about such things in an effort to play as often as possible.
"I think he's well aware now that he's got to express anything that he is feeling to get back to the point of being able to go day in and day out in the lineup," Farrell said. "It's unfortunate, but yet, at the same time, this is the situation that he and we are dealing with."
Lawrie is hitting .282 with nine home runs and 40 RBIs in 100 games this season.