UPDATE: Zach Buchanan of the Arizona Republic tweets that the Diamondbacks aren't discussing a bullpen trade with the Pirates, so we can rule out Brad Ziegler.
After acquiring Aramis Ramirez earlier today, the Pirates are in talks for another trade, possibly for bullpen help, Ken Rosenthal reports.
Sources: #Pirates working on another trade. Believed to be for a reliever.— Ken Rosenthal (@Ken_Rosenthal) July 24, 2015
The Ramirez trade made all kinds of sense. This one would be a bit more surprising, since the Bucs' bullpen is already plenty good. Still, relief help is usually pretty cheap at the trade deadline, and there's no harm in upgrading. I can't see the Pirates paying a premium for a high-profile closer, like Francisco Rodriguez. A groundball-inducing type might make sense, although I don't know who such a player would replace on the roster -- Deolis Guerra is the obvious answer, but he has performed well and is out of options. The team should also be able to add John Holdzkom in September, just like it did last year, so it doesn't seem to have an acute need for relief help.
So I'm not sure what the Pirates might be planning here. Some ground-ball types on non-contending teams include Brad Ziegler (Diamondbacks), Jake Petricka (White Sox), Sam Dyson (Marlins), Luis Garcia (Phillies) and old friends John Axford (Rockies) and Bryan Morris (Marlins).