According to multiple outlets, and the mother ship. Wily Mo is in DL's sights. MLB.com has a rumor rundown with the following except:
Red Sox: It may only be a matter of time before Kielty joins the Red Sox in Wily Mo Pena's current role. Pena has been mentioned in rumors involving the Washington Nationals and Pittsburgh Pirates.
Why oh why would the Pirates want another guy who doesn't know the term "Base on Balls" and has an affliction of hovering at the Mendoza Line? He is a right handed batter with mucho power but no plate discipline. His defense is questionable at best. Classic DL move.
I would expect Jack Wilson and a reliever would be sent to Boston for Wily Mo and a minor leaguer. The reliever would likely be Marte since Boston's primary lefty specialist has been struggling all season.