Aardsma will be called up from Triple-A Gwinnett on Tuesday, Mark Bowman of MLB.com reports. The 33-year-old Aardsma, who has 306.1 innings of big-league experience, recently opted out of a minor-league contract with the Dodgers. Although he hasn't put together a strong season in the majors since 2009, he has pitched well at the Triple-A level this year, posting a 2.29 ERA and 25:7 K:BB ratio over 19.2 innings. Aardsma will likely serve as a middle reliever, and he could pick up a few holds along the way.