The Rangers recalled Macko from Triple-A Round Rock on Saturday.
Macko was sent down to the minors last Saturday but will be invited back into the Rangers' bullpen to make up for the loss of Michel Otanez (illness). Macko has turned in a 5.65 ERA and 1.71 WHIP across 28.2 innings in the majors this season and will almost certainly be limited to low-leverage work.