The Reds optioned Maxwell to Triple-A Louisville on Saturday.
Maxwell struggled to limit traffic on the basepaths during spring training, posting a 5.40 ERA and 2.04 WHIP over 8.1 innings, though he managed to collect 13 strikeouts in that span. If the 25-year-old can right the ship at Louisville, the Reds may consider recalling him to join the big-league bullpen as a depth piece.