Legumina was optioned Tuesday to Triple-A Louisville, C. Trent Rosecrans of The Athletic reports.
Legumina was acquired by the Reds from the Twins over the summer in the deadline deal for Tyler Mahle. The right-hander forged a 4.80 ERA in 33 appearances -- 16 starts -- over 86.1 innings between High-A Cedar Rapids and Double-A Wichita last season.