The 35-year-old lefty was released by the St. Louis Cardinals last week after posting a 10.13 ERA over eight innings in 11 games. Romero struggled mightily, particularly in his last three outings, giving up six hits, nine earned runs and two home runs while recording only four outs.
Orioles executive vice president of baseball operations Dan Duquette said Tuesday that the club was still actively seeking ways to upgrade and add depth to the pitching staff, and Romero fills a need: another lefty reliever to go along with Zach Philips. The O's bullpen currently has two lefties in Troy Patton and Dana Eveland.
Romero previously pitched for the Philadelphia Phillies from 2007-11, posting a combined 2.73 ERA along with notable postseason success in '08. He was suspended for the first 50 games of 2009 for taking a banned supplement, and was released by the Phillies in 2011.
Romero then latched on with Minor League deals for the Washington Nationals, New York Yankees and Colorado Rockies -- with whom he pitched to a 4.32 ERA in 11 big league games -- before making the Cardinals this spring.
In 14 Major League seasons, Romero is 34-28 with a 4.15 ERA.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.