Martinez had been designated for assignment on Dec. 22, so that a spot on the 40-man roster could be opened for free-agent signee Kevin Correia. Following that roster move, Pittsburgh had 10 days to trade, release or outright Martinez to the Minors.
Martinez's stint with the Pirates was a brief one. He was acquired along with outfielder John Bowker from the Giants for Javier Lopez at the July Trade Deadline. He spent a month pitching in Triple-A before joining the Pirates in September.
With Pittsburgh, Martinez made five appearances out of the bullpen. He was expected to provide either starting pitching depth or compete for a spot as a middle reliever.
Jenifer Langosch is a reporter for MLB.com. Read her blog, By Gosh, It's Langosch, and follow her on Twitter @LangoschMLB. This story was not subject to the approval of Major League Baseball or its clubs.