After receiving an off-day Saturday to rest his shoulder, Rolen was initially placed in the lineup for Sunday's game. However, persistent soreness caused him to be scratched from the lineup just before game time.
"Hopefully, it's going to be best for him, because he was having problems with the range of motion in his shoulder," said Jays manager Cito Gaston. "He was playing and not really being himself as far as swinging the bat. So maybe this will give him a chance to, in a couple of weeks, get some more range of motion.
"We'd like to see him back where he used to be as far as a power hitter, a guy who drives in some runs."
Rolen has been fighting through left shoulder woes this season. It is the same shoulder which forced him to undergo two operations to repair a torn labrum in 2005, along with another surgery last September to clean out scar tissue.
Rolen had said recently that the strength and flexibility with his arm were fine, but that his shoulder wasn't functioning mechanically the way it should. Hoping to help the situation, the Jays devised a plan for Rolen to receive extensive rehab along with more frequent days of rest between his starts. That hasn't helped, though, which has led to his placement on the DL.
Gaston was not certain that Rolen would be able to return when he is scheduled to come off the disabled list Aug. 24.
"Who knows if two weeks is going to be enough?" Gaston said. "I don't know. He's had surgery on that arm and a lot of scar tissue in there, so we'll just try to get him some more flexibility in there."
Rolen said that the deep massages he would receive during his rehab have also contributed to additional pain in his neck and back.
"The rehab is pretty intense -- digging pretty deep into the shoulder and the capsule trying to loosen up some tissue," Rolen said. "When we're doing that and I'm trying to play and swing a baseball bat at the same time, we're kind of counteracting what we're doing.
"If we give it time to cool down a little bit and get in there and dig and get after that without having to swing the bat and undo it, that's hopefully going to help it recover a little better."
The 33-year-old Rolen also missed the first 23 games of the season with a right finger injury. In 88 games this year, he is batting .252 with seven homers and 38 RBIs.
David Singh is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.