Astros designated RHP Hector Ambriz for assignment.
Astros optioned RHP Hector Ambriz to Triple-A Oklahoma City.
Hector Ambriz retired two of the three batters he faced Wednesday in his return to the majors.
Hector Ambriz will join the Astros on Friday.
Hector Ambriz earned his second save of the season in Sunday's win over the Angels.
Hector Ambriz recorded his first major league save Thursday by striking out two in a scoreless ninth against the Rockies.
Hector Ambriz allowed two hits but escaped his inning of relief unscathed in Monday's extra-inning victory against the Rockies.
Hector Ambriz (ankle) is scheduled to throw live batting practice this week.
Hector Ambriz (ankle) will throw off a mound Friday.
Hector Ambriz (ankle) threw lightly on Monday.
MLB.com's Brian McTaggart reports that X-rays on Hector Ambriz's left ankle came back negative.
Hector Ambriz (ankle) was wearing a walking boot on his right foot Friday.
Hector Ambriz rolled his right ankle while trying to cover first base Thursday during a fielding drill.