Arizona acquired Pilkington from Cleveland on Monday in exchange for cash considerations.
Pilkington had been removed from Cleveland's 40-man roster late last week and has now found a new home. The left-hander has a limited ceiling but is a capable depth arm for Arizona. He's posted a 3.75 ERA over 16 appearances (11 starts) at the big-league level and will likely slide into Triple-A Reno's rotation.