The Mariners placed Davila on the 15-day injured list Monday with a right SC joint sprain in his shoulder.
Davila had just been recalled from Triple-A Tacoma on Sunday, and he hurt himself in an appearance later that day in the Mariners' 7-0 loss to the Blue Jays. Though he will be eligible for activation in mid-September, the nature of the injury points to Davila being out longer than that, possibly for the rest of the season.