Soroka is working his way back from twice tearing his right Achilles tendon. He missed more than two full seasons.
Munoz, 23, is a reliever who has yet to make his major league debut. This season, he has split time between Gwinnett and Double-A Mississippi and has a combined 4.94 ERA in 27 1/3 innings.
The Braves designated Luetge for assignment last week after he posted a 1-0 record with a 10.24 ERA in nine relief appearances. With this move, the 36-year-old will be able to remain with the Braves without occupying a spot on the 40-man roster.
The Braves, who lead the National League East, open a six-game homestand on Tuesday against the New York Mets.