The Cubs claimed Zastryzny (elbow) off waivers from the Brewers on Monday, Maddie Lee of the Chicago Sun-Times reports.
It's a return to his original organization for Zastryzny, who was drafted by the Cubs and spent his first three major-league seasons in Chicago. The lefty reliever ended the season on the injured list with elbow tendinitis but looks to be healthy headed into the offseason.