Nobody knows just how bad Carney Lansford is injured. Not even Lansford.

It will be about 10 days before the Athletics know how severely their veteran third baseman injured his left knee in a New Year's Eve snowmobile accident."We're obviously nervous and Carney's nervous," team physician Dr. Allan Pont said Friday. "We remain hopeful he'll be fine. We won't know that until Dr. Bost puts the scope in him."

Dr. Rick Bost will perform an arthroscopic examination after severe cuts and scrapes are sufficiently healed, which should be about 10 days, Pont said.

Lansford hurt his knee and right shoulder Tuesday night when his snowmobile crashed into a fence near his Baker City, Ore., ranch.

It would be "premature to speculate on his period of recovery" until the arthroscopic evaluation is completed, the A's said in a statement.

The injury to the player's right shoulder was diagnosed as a moderate sprain, the team said, but the knee is a more serious problem.

Magnetic resonance imaging tests by Bost revealed "probable damage" to Lansford's medial collateral and anterior cruciate ligaments that may require surgical repair, the team said. There apparently was no break or cartilage damage.

"Could it be serious? It could be serious. Could it be a lot less serious? It could be," said Pont.

"I think it's premature to say whether or not he'll be available for spring training. I think we need a couple of weeks to know where we're going with this," he said.

The 33-year-old Lansford underwent the tests at Children's Hospital in San Francisco on Thursday, shortly after arriving from Oregon.

Lansford was staying at his baseball season home in Contra Costa County on Friday.

The A's said Lansford never was a hospital inpatient and is walking, but could miss the 1991 season.

Currently the player with the most tenure on the A's, Lansford was acquired from Boston after the 1982 season in exchange for outfielder Tony Armas and catcher Jeff Newman. Last season he hit .268 with three home runs and 50 RBIs in 134 games as Oakland won its third consecutive American League pennant.