Manager Buck Showalter was forced to dip into his bullpen early Sunday, with Ubaldo Jimenez lasting just 2 1/3 innings and the team needed some fresh arms in the event of another short outing. Stinson allowed nine earned runs over 11 1/3 innings -- six of which came April 13 -- and last appeared in a game for the O's on April 27 before he was designated for assignment.
Left-hander Johan Santana was transferred to the 60-day disabled list to clear a 40-man roster spot.
Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Facebook and Twitter @britt_ghiroli. David Wilson is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.