Olmos appeared in four games for the Cubs this spring, allowing three runs on four hits over 3 1/3 innings. Olmos, who was outrighted by Chicago on Feb. 16, was a non-roster invitee in camp. He will report to Minor League camp, but the Orioles still want to take a look at the 25-year-old.
Olmos spent the 2015 season with the Mariners, posting a 1-0 record with a 4.50 ERA in six Major League games (two starts).
Olmos is the O's second lefty acquisition in two days. With left-handed reliever Brian Matusz expected to go on the disabled list, Olmos gives them another option beyond Zach Phillips.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, follow her on Facebook and Twitter @britt_ghiroli, and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.