Smeltzer was reassigned to minor-league camp Saturday, Jordan McPherson of the Miami Herald reports.
Smeltzer had a strong spring debut against the Astros on Feb. 27, but he proceeded to give up seven earned runs on 13 hits over 5.2 innings in his next two appearances. He is capable of serving as a spot starter and/or long reliever, but Smeltzer is not on the 40-man roster, so he could spend most or all the season at Triple-A.