"To get it taken care of right now, moving forward, getting the shot was the best idea to do," Pearce said following the win. "So we're going that route, and I'm very optimistic I'll be back in a couple days."
Pearce, who was replaced by Nolan Reimold in the fifth, didn't look comfortable making a throw in from right field on Todd Frazier's sacrifice fly.
"It's been lingering all year, but we've been managing it and on top of it," said Pearce, who played infield with Tampa Bay all season. "The whole goal was to get my arm ready to start playing the outfield, and it just kind of wasn't there yet."
"I don't want to broadcast it, but I guess I have," manager Buck Showalter said of Pearce's availability. "Hopefully by Tuesday or Wednesday, we have an idea of where are. We will make contingency plans if we need to."
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.