Melville had his contract selected from Triple-A Louisville on Sunday.
Melville had already been announced as Sunday's starter with Anthony Desclafani on the shelf due to an oblique injury, but this move makes it official. Brandon Allen was designated for assignment to clear up a spot on the 40-man roster. Per Zach Buchanan of the Cincinnati Enquirer, Desclafani isn't exactly a lock to make his next turn in the rotation, so depending on Melville's performance Sunday, he could see more than one start in the big leagues.