The Pirates would like to upgrade their bullpen and could use a lefty, Jon Morosi writes. Separately, Rob Biertempfel writes that the Bucs "like" Pat Neshek, who is a righty. The Bucs can use extra bullpen help, particularly after losing Justin Wilson in the Francisco Cervelli trade.
With Andrew Miller off the market (and the Pirates not likely to be players for him anyway), the lefty relief market isn't a strong one, but perhaps the Pirates could pursue someone like Wesley Wright (who has a nifty ground ball rate and still isn't quite 30) or Neal Cotts. They could also try to find someone off the scrap heap, given their past success doing that with relievers.
Neshek is a fly ball pitcher, and Ernesto Frieri has shown us what can happen when fly ball pitchers go wrong. Still, Neshek had a great season in 2014, and he might be available reasonably cheaply, because he didn't have an outstanding track record before that.