The Guardians optioned Strzelecki to Triple-A Columbus on Sunday.
The move is to make room on the 26-man roster for left-hander Joey Cantillo, who will make his major-league debut Sunday against the Phillies. Strzelecki made four outings out of the Guardians' bullpen after being recalled from Columbus on July 21. Over those four outings, the 29-year-old right-hander allowed one run on five hits while striking out five across 4.2 innings. In 29 Triple-A appearances this season, Strzelecki has a 4.18 ERA and 1.15 WHIP over 32.1 innings.