SAN FRANCISCO -- Second baseman Freddy Sanchez confirmed on Saturday that he'll miss the rest of the season with a partially torn meniscus in his left knee.

Given the questions surrounding his contract status and his health, Sanchez couldn't be certain whether he'll ever play for San Francisco again.

Sanchez expressed hopes that the Giants will decide whether to bring him back before the free-agency filing period begins, which is the day after the final game of the World Series. The Giants also would retain exclusive rights to signing Sanchez for 15 days once the filing period starts.

It had been believed that the Giants would decline to pick up the $8 million option on Sanchez's 2010 contract -- which includes a $600,000 buyout -- and try to sign him to a multiyear deal with a lower average annual value. But Sanchez's injuries, not just the knee but also a shoulder ailment, limited him to 25 games after the Giants acquired him from Pittsburgh on July 29 and have cast doubt upon his future with San Francisco.

"Obviously, we don't know what's going to happen," said Sanchez, the 2006 National League batting champion who hit .284 with the Giants and .293 overall. "It's going to be up to them whether they want to do something. I'm not really worried about that right now. I'm worried about having successful surgery and getting healthy. Wherever I am next year, I know I'm going to be 100 percent and ready to go."

Sanchez, who said that he expects to undergo arthroscopic knee surgery this week, initially injured the knee in Arizona one series before the Pirates traded him to the Giants at the conclusion of a trip to San Francisco. He acknowledged knowing then that he faced the "possibility" of surgery. But a cortisone shot helped him cope with the injury short term.

That hasn't silenced fans who consider Sanchez "damaged goods" and feel bitter about the Giants' parting with pitching prospect Tim Alderson to obtain him.

"I understand what they're going through, but I don't let that stuff get to me," Sanchez said. "I know what I'm capable of doing when I'm healthy. This was just a freak incident that unfortunately shut my season down early."

Sanchez, 31, emphasized that he doesn't consider his injury to be serious and should be able to begin his offseason workouts on schedule.

"Talking to the doctors and knowing my body, I know this is not a major surgery," said Sanchez, who has been sidelined since he aggravated the injury Monday at Arizona. "They're going to clean up the tear, and I'll be back in a month or two."