Orioles manager Buck Showalter said he's encouraged by the diagnosis after talking to the team's medical staff, and he reminded reporters that Gallardo got a late start to Spring Training.
"He wasn't behind, but there was no margin for error there. I think he may have pushed a little early, so I think this may be a good period for him," Showalter said. "I have a lot of confidence that we'll get the pitcher back that he's capable of being."
The Orioles don't have a timeline on Gallardo, and they likely won't until he picks up a ball within the next week. They're hoping his situation is similar to that of Monday's starter Kevin Gausman, who was on the disabled list for about a month with right shoulder tendinitis.
The 30-year-old Gallardo, in his 10th Major League season, has never been on the DL for an arm injury, and this was his first cortisone injection. Showalter said that bodes well for the Orioles and that Gallardo was already feeling better on Monday.
Brittany Ghiroli has covered the Orioles for MLB.com since 2010. 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.