Perdomo was optioned to Triple-A Nashville on Tuesday, Will Sammon of The Athletic reports.
Perdomo appeared in three games after being called up July 17, allowing one run and striking out six in 2.2 innings of work. His 6.46 ERA in 2021 doesn't exactly merit a return to the Brewers, but injuries in the bullpen could certainly give him another opportunity before the season ends. Devin Williams (elbow) was activated from the 10-day injured list in a corresponding move Tuesday.