Toronto's designated hitter was a late scratch from Friday night's game against Detroit after his back tightened up during batting practice. He remained on the bench the following day.
Lind dealt with lower back problems for most of the 2011 campaign, but the discomfort has surfaced in a different area this week.
"It's higher up, it's in the mid-back," Blue Jays manager John Farrell said. "It seems to be more musculature, whereas last year, in the lower back you've got more of the hip and the facet joints that are down at the bottom part of the spine -- where they came into play last year."
Lind went through another round of treatment on Saturday morning. But the club doesn't have the luxury of being very patient while waiting for word on when he might be able to return.
Toronto is currently carrying just three position players on the bench because of an eight-man bullpen. In order to avoid any potential roster issues, the Blue Jays are expected to make a decision on Lind before they embark on a West Coast trip at the beginning of next week.
"He loosened up a little bit after treatment. But given where we are with eight relievers and a very short bench to begin with, if there's not some improvement as we get through the day, we may be looking at a [stint on the disabled list]," Farrell said.
The injury is another setback in what has been a frustrating year for Lind. The 29-year-old spent more than a month at Triple-A Las Vegas after a disappointing start to the season, but had since begun to turn things around.
Lind is hitting .288 with five home runs and 16 RBIs in 24 games since being recalled and had made a return to the heart of the Blue Jays' batting order.