"I'm done," Ellis said before the opener of a four-game series against the visiting Rangers at McAfee Coliseum.
Ellis, who will be a free agent when the season ends, had been holding out hope that he'd be able to get back onto the field at some point this month, but an MRI exam revealed what he called "chips" in some of his shoulder cartilage, and team orthopedist John Frazier has recommended surgery.
"Definitely not the news you want to hear," said Ellis, who batted .233 with 12 homers and 44 RBIs in what many expect to be his last season with the A's. "It's not good timing by any means."
Ellis missed the entire 2004 season after tearing the labrum in his right shoulder in a Spring Training collision with shortstop Bobby Crosby, but he opted for rehab over surgery.
The second baseman's most recent MRI showed the labrum is still torn, but that's of little concern to Ellis, who is going to get a second opinion from Dr. Lewis Yocum -- a noted arm specialist who works for the Angels -- before he submits to surgery.
The MRI films are being sent to Yocum's office, and Ellis expects to know more about his immediate future by Monday.
"I've had a torn labrum for four or five years, so that's no big deal," Ellis said, calling his current injury "unrelated" to the one that knocked him out of action in 2004.
Should Yocum concur with Frazier, Ellis said he'll have the surgery as soon as possible. The recovery time will be an estimated three to four months.
"I should be ready by [Spring Training], for sure," Ellis said.
Whether he'll be at Spring Training with the A's or another team, Ellis has no idea. But until he gets word from Yocum, he plans to stay in Oakland with his teammates.
"I'll be here as long as I can," he said.
Mychael Urban is a national writer for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.