Yates, who apparently most of the year has been battling on-again off-again elbow inflammation, was placed on the 15 day disabled list today, retroactive to yesterday (the 16th). There is supposedly no structural damage.
To fill the opening, Tom Gorzelanny (?) was recalled from AAA. Apparently the idea is that they wanted someone who could pitch multiple innings if needed, as Sean Burnett threw 46 pitches yesterday and presumably won't be able to do that again for at least another day. Once the long relief need is gone, Russell says they want Gorzelanny starting (presumably for Indianapolis) and someone else coming out of the pen.
Here is a story on pittsburghpirates.com.