The Astros recalled Whitley from Triple-A Sugar Land on Sunday.
Whitley will receive his first look in the majors since mid-April, when he allowed a hit and a walk in a scoreless two-thirds of an inning during his MLB debut. The right-hander has been an effective bullpen piece at Sugar Land this season with a 2.17 ERA, 1.14 WHIP and 40:9 K:BB across 29 innings.