LOS ANGELES -- After an unsuccessful pregame workout Saturday, Dodgers outfielder Andruw Jones decided to undergo surgery to repair torn cartilage in his right knee and will be placed on the 15-day disabled list.

Dr. Neal ElAttrache will operate on Jones on Tuesday. Recovery time is estimated at four to six weeks, with Jones hoping to get back by the All-Star break.

"It was better to go ahead and get it done and get ready for the second half," Jones said.

He will be replaced on the roster by Terry Tiffee, who is hitting .422 at Triple-A Las Vegas, leading the Pacific Coast League.

To make room for Tiffee on the 40-man roster, the Dodgers moved Nomar Garciaparra to the 60-day disabled list, an indicator that his calf injury is not healing and still has not be definitively diagnosed. He won't be eligible to return until June 26.

Jones, who had never been disabled in a 12-year career, signed a two-year, $36.2 million contract with the Dodgers in December to provide the threatening bat the lineup had been missing.

"Hopefully, this not only will help him physically, but also help his game," said general manager Ned Colletti. "He took three days of rest, came back yesterday, but called Stan [Conte, trainer] and said he has to get it fixed. We need to get him back to the player he's been.

"I've contended all along his approach at the plate is impossible to hit with his rear leg collapsing."

Jones reported to Spring Training overweight and has shown none of the power the club envisioned. Last Sunday, Jones complained of knee pain and on Monday conceded he had been playing with discomfort "for months" but was confident he could play through the pain.

Jones had not played since Sunday until inserted into Friday night's game with runners on the corners and two outs in the bottom of the ninth inning, only to end the game with a strikeout. Jones is batting .165 with two home runs and seven RBIs. He also has 45 strikeouts in 133 at-bats and is 1-for-33 with runners in scoring positions.

"Not to be on a high level to perform, it [stunk]," Jones said. "It's one of those things that you talk about it mentally, and hopefully these four weeks, five weeks I get off I'll get myself ready. I'll get myself mentally prepared, too."