The Astros have outrighted reliever Chia-Jen Lo to their Triple-A club after the right-hander cleared waivers, Jose de Jesus Ortiz of the Houston Chronicle tweets. Lo was already pitching at Triple-A, but the move takes him off Houston's 40-man roster.
Lo tossed 19 1/3 innings out of the bullpen for the Astros last season, posting an ERA of 4.19. He struck out 7.4 batters per nine innings but allowed a 6.1 BB/9. The 28-year-old has a strong track record of missing bats in the minors, averaging an even 10 strikeouts per 9 over 129 career innings there.
The Astros now have 39 players on their 40-man roster.