"I'm anxious to hear what the doctor says about what the future may hold after looking at it," Showalter said.
After Adam Jones was ejected in the first inning Friday for arguing balls and strikes, Gentry replaced the center fielder to start the second inning. He was then replaced by Joey Rickard to start the fourth after his only at-bat.
Gentry's injury occurred on an unsuccessful bunt attempt on an 0-1 count. He then struck out and left the game.
The outfielder has slashed .257/.333/.386 this season, but it's his speed that the Orioles value most; he's 5-for-8 on stolen-base attempts.
Joshua Needelman is a contributor to MLB.com based in Baltimore. This story was not subject to the approval of Major League Baseball or its clubs.