The Astros will go with a match-up based approach to their bullpen roles for now. Hader will undergo more testing on the sore shoulder.

Hader, 31, has pitched just three times in August, with his most recent appearance (on Aug. 8) doubling as his seventh this season in which he's logged four or more outs. He's been highly effective overall, tallying a 2.05 ERA (202 ERA+) and a 4.75 strikeout-to-walk ratio.

The Astros put Josh Hader on the 15-day IL with a shoulder strain and DFA'ed veteran reliever Hector Neris. Read more at MLB Trade Rumors.