Milone complained of pain following his Friday start in which he gave up four runs to the Seattle Mariners in six innings. The left-hander is 5-3 with a 3.76 ERA in 14 starts this season.
Minnesota will purchase the contract of right-hander Tyler Duffey from Triple-A Rochester and announced Sunday that Duffey will make his major league debut on Wednesday at Toronto. Duffey is 6-8 with a 2.66 ERA in 21 starts between Double-A and Triple-A this season.
The Twins will transfer reliever Ryan Pressly (right lat strain) to the 60-day disabled list to make room for Duffey on the 40-man roster.