Gentry is scheduled to take part in coaches' batting practice on Sunday, putting him that much closer to game action.
It remains to be seen whether he'll be Opening Day-ready, but the A's are hopeful that's the case. If not, Sam Fuld or Michael Taylor will fill in as the club's fourth outfielder.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.