Manager Tony La Russa said on Friday afternoon that he is "certain" Ludwick will be put on the DL, while general manager John Mozeliak hedged a bit but not much.
"No decision will be made till tomorrow, till we decide what we're going to do and we see how he feels," Mozeliak said. "But I'd say it's a high probability that he's going to go on the DL."
The move will be retroactive to last Saturday. Ludwick last played one week ago, on June 25 in Kansas City. He first suffered the injury on June 22 in Toronto. He would be eligible to come off the DL on July 11, the last day before the All-Star break. Ludwick was jogging on a treadmill as part of his rehabilitation when he aggravated the injury.
"I aggravated it a little bit, felt it a little bit," he said. "So it's probably a smart thing not to go on it. We'll see how it feels tomorrow. From what I've heard, I'm probably going to go on the DL. So we'll go from there."
The Cardinals will most likely call up an outfielder to take Ludwick's place on the roster. The leading candidates for a promotion would be Jon Jay, Allen Craig and Joe Mather, all of whom have played for the big league club this year.
Matthew Leach is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.