Pressly was placed on the 15-day injured list due to neck spasms Thursday, retroactive to Aug. 22, Danielle Lerner of the Houston Chronicle reports.
Pressly was unavailable over the last two days due to neck stiffness, and the issue will ultimately force him to miss at least two weeks. Bryan Abreu earned a one-out save Tuesday, but Rafael Montero will likely be the top candidate to handle closing duties until Pressly is cleared to return.