The Diamondbacks transferred Melancon (shoulder) from the 15-day injured list to the 60-day IL on Sunday.
Melancon will move off the 40-man roster to help clear room for two new bullpen additions for the Diamondbacks in Peter Solomon and Jose Ruiz. The right-hander isn't expected to return until the summer after receiving a platelet-rich plasma injection in his strained shoulder in the middle of March.