Houston Astros All-Star closer Josh Hader was placed on the 15-day disabled list Tuesday with a strained left shoulder. The move, retroactive to Monday, comes after the left-hander reported shoulder discomfort before Monday's game against the Boston Red Sox.

Josh Hader going on the injured list was part of a series of moves the Astros made Tuesday involving their bullpen.

Hader is likely to be replaced by Bryan Abreu in save situations for now, but the rest of the Astros' bullpen alignment is up in the air.