From Baker:

From what I've been hearing, pitcher Shawn Kelley has a strained oblique, but it's more like a torn one to be honest. Now, get this straight. A strained muscle is, in fact, a tear. There are different degrees of tearing in strains, from microscopic to more severe. And from what I'm hearing, this one could keep Kelley out about a month. Maybe even six weeks. We don't know yet, but he's definitely heading to the DL.

Somehow Garrett Olson doesn't make me feel any better about this.