The Astros outrighted Montero to Triple-A Sugar Land on Saturday.
After he was designated for assignment Wednesday, Montero unsurprisingly went unclaimed off waivers, given that he's in the second season of a three-year, $34.5 million contract. Montero would have forfeited the money remaining on the contract had he elected free agency, so he'll stick around in the Houston organization and look to impress at Sugar Land with the hope of earning another look in the big-league bullpen. The 33-year-old had appeared in 41 games for the Astros this season, registering 10 holds with a 4.70 ERA, 1.41 WHIP and 23:19 K:BB across 38.1 innings.