The Diamondbacks plan to move Montgomery to the bullpen beginning with this weekend's series in Boston, John Gambadoro of Arizona Sports 98.7 FM reports.
Montgomery has never got on track after signing late in spring training with Arizona and not making his season debut until late April. The left-hander has posted an ugly 6.44 ERA and 67:36 K:BB over 95 innings covering 19 starts, and with Ryne Nelson thriving of late, Nelson will retain his spot in the rotation while Montgomery moves to a long-relief role.