The Indians recalled Armstrong from Triple-A Columbus to serve as their 26th man for Wednesday's doubleheader with the Yankees.
Armstrong will give the Indians some extra coverage in the bullpen during the twin bill with Dan Otero (paternity) landing on the paternity list. The 26-year-old has previously made 19 appearances with the big club this season, registering a 4.76 ERA and 1.37 WHIP over 22.2 innings.