Showalter refused to rule Bourn out for Opening Day.
"If we had to push the envelope, we could," Showalter said.
The Orioles signed infielder Paul Janish to a Minor League contract on Saturday. It's the third straight year Janish has signed a Minors contract with an invitation to Spring Training.
"Paul's a very good defender," Showalter said. "He's a very reliable baseball player. He's one of those guys that's going to be able to do whatever he wants to do in the game one day. He understands who he is and what he brings, and you know you're going to get it from him.
"He's as good a shortstop as you're going to find out there for this role."
J.J. Hardy hasn't played yet due to back spasms, and he isn't expected to until March 10, and while Hardy is out, Manny Machado is playing shortstop until he leaves to play for the Dominican Republic on March 5.