OAKLAND, CALIF. ? Oakland Athletics second baseman Mark Ellis will miss the entire season because of a right shoulder injury that requires surgery.

Ellis, who has been rehabilitating in Phoenix, was in the Bay Area on Saturday to meet with team doctor Jerrald Goldman about the latest MRI on the shoulder. The test revealed a torn labrum, and Goldman will perform the operation. No date had been set.

Ellis initially was expected to miss about two months after he dislocated his shoulder in a collision with shortstop Bobby Crosby during a spring-training game against the Chicago Cubs on March 25.

“Mark is a good player, but we have other players lined up,” manager Ken Macha said after the Athletics beat Seattle, 2-1, Saturday. “We can’t go out and play much better than we have in the first five games. I hope the surgery goes well. There was a comment on the bench today that if anybody can work their way back, it’s Mark because of the way he works. It’s a shame, because he put a lot of work into this offseason.”

Trainer Larry Davis said it wasn’t yet clear how long Ellis would need to recover because doctors wouldn’t know the extent of the tear until performing the operation, expected to be in two or three weeks.

“All along we suspected something like this,” Davis said. “But you spend a lot of time trying to prove it wrong.”

Reports surfaced late in spring training that Ellis probably would miss the whole season.

But the A’s wanted to wait for a second MRI to be sure of his status after the initial test was inconclusive because there was so much swelling and blood in his shoulder.