Left-hander Ashur Tolliver joined the Orioles in Houston on Tuesday, and was added to the roster, the team announced.
Tolliver will fill the vacancy left by the trade of left-hander Brian Matusz, who along with a 2016 draft pick was dealt to the Atlanta Braves on Monday for two minor league pitchers.
Tolliver, 28, had a 2.42 ERA in 18 appearances for Double-A Bowie, after striking out 61 in a career-high 58 2/3 innings with the Baysox in 2015. The former fifth-round pick dealt with shoulder problems that threatened his career, but got his first major league opportunity today.