Raley was activated by the Astros on Tuesday, Brian McTaggart of MLB.com reports.
Raley was traded to the Astros on Sunday, and he'll officially join the major-league bullpen following Tuesday's move. The southpaw probably won't be tasked with many important innings. To make room for Raley on the active roster, right-hander Carlos Sanabria was optioned to the team's alternate training site.