The Orioles also optioned pitcher Yefry Ramirez to Triple-A Norfolk, recalled left-hander Tanner Scott from the Tides and purchased infielder Corban Joseph's contract from Double-A Bowie.
Joseph, the younger brother of catcher Caleb Joseph, was batting .336/.394/.550 in 59 games with Bowie. His wearing No. 51.
Joseph has played only two games in the majors with the Yankees back in 2013 - in both ends of a May 13 doubleheader. He went 1-for-6 with a double and walk.
The Orioles designated left-hander D.J. Snelten for assignment to make room for Joseph on the 40-man roster.
Bleier strained his lat muscle in the eighth inning of Wednesday's game against the Red Sox. He underwent an MRI yesterday and will seek a second opinion.
Not only did Bleier lead the team in relief appearances with 31, he was 3-0 with a 1.93 ERA with seven runs and 36 hits allowed in 32 2/3 innings. He's posted ERAs of 1.96, 1.99 and 1.93 over 111 games in three major league seasons, the first with the Yankees in 2016.
Scott gives the Orioles a second left-hander in the bullpen besides closer Zach Britton. Joseph expands the bench to five players.
Joseph has played first base, second base, third base and left field.