TAMPA, Fla. (AP) – Gary Sheffield is not interested in extending his contract with the New York Yankees.

The slugging right fielder is in the second season of a $39 million, three-year contract. The Yankees have a $13 million option for the 2007 season, and Sheffield wants to wait for this contract to run out before considering a new one.

“I don’t want one,” Sheffield said Monday. “When this is over, that’s it. When this deal is done, I don’t look past it. I can’t predict if somebody is going to want me.

“All I know is that I’ve got three years and an option. When that time comes, I’ll deal with it then.”

Sheffield is still dealing with discomfort in his left shoulder that was operated on in November. He is taking a slower pace during spring training and likely will sit out at least three preseason games.

Sheffield hit .290 with 36 homers and 121 RBIs last season, his first in New York. Because of the sore shoulder, he often had trouble raising his glove above chest level to catch fly balls.

He is expected to be ready for the regular season opener April 3 against Boston.

New York closer Mariano Rivera is also working his way back. He threw 43 pitches in his first batting practice session Monday, and could pitch in a spring training game next week.

The Yankees are taking a slow approach with Rivera, 35, this spring. He isn’t expected to pitch in any early spring games but should be healthy for opening day.

“The way I feel, a week and I’ll be throwing,” Rivera said. “Every day I’m feeling better and better. I’m going to see how I feel tomorrow and go from there.”

Pitching coach Mel Stottlemyre said Rivera will throw batting practice again Wednesday or Thursday. Stottlemyre agreed that Rivera might pitch in about a week and that a schedule will be developed after the next BP session.

“He’s getting better each time out,” Stottlemyre said. “It’s another step.”

Notes: C Jorge Posada has a stiff neck, but could play Thursday. … Hideki Matsui homered in Monday’s intrasquad game. … DH Jason Giambi went 0-for-2 with a walk. He hit just .208 in 80 games during an injury-filled season last year. “I felt like I was on the ball,” Giambi said. “It was a good day.” … 3B Alex Rodriguez stumbled to the ground while catching a popup on the pitcher’s mound during pregame drills.