TAMPA, Fla. -- Yankees captain Derek Jeter will be out of the lineup until at least Friday with a stiff left calf.

Jeter, 37, was originally expected to return to action on Tuesday, but the Yankees are treating his injury conservatively after he missed time last season with a right calf injury. Jeter hasn't played since last Wednesday.

"I haven't run," Jeter said. "Being cautious makes sense."

Manager Joe Girardi said that there was no reason to play Jeter the next two days, which would have him taking long bus trips to Port Charlotte, Fla., (Rays) and Fort Myers, Fla., (Red Sox).

"Last year, his calf became an issue," Girardi said. "Even though it's a different one, I don't want it to become an issue. We have some long road trips Wednesday and Thursday, so if I can buy him some time, I'll buy it."

Jeter took batting practice indoors on Tuesday and will do so again on Wednesday. He is expected to return to the field for workouts on Thursday, testing the calf on the infield dirt.

Swisher exits first game back with groin injury

TAMPA, Fla. -- Yankees outfielder Nick Swisher was forced to exit Tuesday's 10-3 Grapefruit League win over the Pirates with tightness in his right groin.

The injury is on the opposite side of the groin from the tightness that had kept Swisher out of the lineup last week. Tuesday marked Swisher's first game back in action, but he had to leave for a pinch-runner after his third-inning at-bat.

"It's frustrating, man," Swisher said. "I don't like getting hurt, banged up and missing days, but I'd rather be missing them now than during the season."

Swisher said it "felt exactly the same" as the previous injury. Head athletic trainer Steve Donohue told Swisher that flexibility may be an issue, and he expected to make some modifications to his program in the weight room.

"Maybe I'm a little tight in that area," Swisher said. "Maybe we need to loosen a couple of things up. We need to get that ready for Opening Day."

Swisher said he did not expect to be sent for an MRI exam on Tuesday, though he had been sent for tests after the initial groin injury. Manager Joe Girardi took no chances, immediately pulling Swisher for pinch-runner Justin Maxwell.

"I don't like coming off the field," Swisher said. "It's not my style. Skip came out and got me, and that was probably the best thing. If it wasn't for me, I'd probably still be out there."

Yanks teach kids environmental lessons

TAMPA, Fla. -- Three members of the Yankees put a rare Spring Training off-day to good use, helping a group from the Boys and Girls Clubs of Tampa make a positive contribution to the planet.

Chris Dickerson, Francisco Cervelli and Eduardo Nunez spent Monday afternoon with about 30 children, planting an evergreen tree and taking part in a science experiment about acid rain and the environment.

"The message is that there are certain things these kids can do to be more environmentally responsible," Dickerson said. "I don't think kids understand that trees are extremely valuable."

Cervelli said that he took something out of the lesson as well, enjoying spending time with the group.

"It was great," Cervelli said. "We had fun and learned a little bit about how you plant a tree, and the fun part was having a good time with the kids. Every time I see kids like that, they're really happy. They smile all the time."

Dickerson is passionate about going green. He is a co-founder of Players for the Planet, whose stated mission is bringing athletes together to inspire and educate communities about the growing environmental crisis.

"Growing up in Southern California, it has always been ingrained in the culture," Dickerson said. "When we were at the beach and surfing, there'd be plastic bags in the water. Sometimes we'd get sick from some of the poisonous runoff into the water in Malibu because it wasn't collected properly. Even as a kid, my teammates weren't showing up because they had asthma and the smog alerts were too high."

Dickerson said he was inspired to make a difference in 2008, when he was playing with Triple-A Louisville, an affiliate of the Reds, while watching players throw plastic bottles in the trash. This year, Dickerson said that he hopes to help add recycling bins to the players' area at Yankee Stadium.

"There's only two, and they're really small -- one in the kitchen and one in the locker room," Dickerson said. "Our whole goal is to break that cycle and [help players] be conscious of what you're doing."

Bombers bits

• Prior to Tuesday's game, the Yankees optioned infielder Brandon Laird and right-handers George Kontos, D.J. Mitchell and David Phelps to Triple-A Scranton/Wilkes-Barre. Major League camp now stands at 52 players: 25 pitchers, five catchers, 12 infielders and 10 outfielders.

• Freddy Garcia (bruised right hand) threw a bullpen session on Tuesday and reported that he felt "good," eyeing a possible start on Friday. David Robertson (bruised right foot) threw his second bullpen session since his injury and will next throw batting practice.