The Cubs recalled Roberts from Triple-A Iowa on Tuesday, Vinnie Duber of the Chicago Sun-Times reports.
With Jameson Taillon (hamstring) moving to the injured list Tuesday, Roberts will come up from Triple-A to give the Cubs some extra bullpen depth. The 28-year-old righty has performed well in the majors this season, posting a 1.96 ERA and 1.09 WHIP over 18.1 innings with Chicago.