Cubs reliever Shawn Camp had been suffering from a toe injury for about a month when he served up the game-winning grand slam to the Pirates on Tuesday.

On Wednesday, the Cubs sent Camp to the 15-day disabled list with a sprained right big toe, replacing him with Triple-A Iowa call-up Rafael Dolis.

The move came one day too late to save Michael Bowden, who was designated for assignment Tuesday to make room for Matt Garza.

"We didn't know about it," manager Dale Sveum said of Camp's injury. "He came in for treatment (Sunday). We didn't know it was that extensive, but obviously (keeping Bowden and putting Camp on the DL) would've been the obvious move."

That move wasn't made because Camp didn't tell the Cubs the toe was bothering him until last weekend. Sveum said he didn't fault Camp for not saying anything and trying to pitch through it.

"He (aggravated) it and then the inflammation got too bad," Sveum said. "I think for a while it was getting too tough to push off the mound, so we've got to give it time to settle down."

Camp was 1-1 with a 7.56 ERA, three blown saves and a loss in velocity that hurt his effectiveness.

Sveum said Camp had the same toe problem in Toronto in 2010 and '11, though it never came up before in his 14 months as a Cub.

Camp flew back to Chicago on Wednesday and was unavailable to comment. He didn't use the injury as an excuse when addressing the media Tuesday night, saying the loss was "on me."

He'll miss at least two weeks and probably longer because Sveum said he'll have to go on a rehab assignment.

"The bad thing about toes is you're always using (them)," Sveum said.