The Reds optioned McCambley to Triple-A Louisville on Tuesday.
The right-hander was called up by Cincinnati on Friday and walked three batters while recording just one out Sunday in Pittsburgh, though Brock Burke extinguished that fire to prevent any runs from scoring. Across his two stints in the majors this year, McCambley has given up three earned runs with a 4:5 K:BB across his first 4.1 big-league innings.