Notes: Robertson out, Claiborne up

David Robertson will not be available out of the Yankees bullpen on Friday, and Joe Girardi does not expect Robertson to pitch at all this weekend against the A's.

"My guess is we’ll get him [back] in Colorado," the manager said. "He’ll be out a few days here, and hopefully it heals up enough that we can use him out there."

The Yankees play a three-game series against the Rockies in Denver, starting next Tuesday.

Robertson felt pain in his lower left hamstring while pitching against the Astros on Wednesday. But he did not sound very concerned about the injury.

"It’s just a little sore, that’s about it," Robertson said. "I’ve been walking around and everything, it’s felt better each day."

REINFORCEMENTS: The Yankees will also be without reliever Joba Chamberlain, as he was placed on the 15-day disabled list on Thursday with a strained right oblique.

To fill Chamberlain's roster spot, the Yankees called up Preston Claiborne from Triple-A Scranton/Wilkes-Barre, who was 0-0 with a 3.48 ERA in eight appearances there, with three saves.

Claiborne, 25, was drafted by the Yankees in the 17th round in 2010, out of Tulane.

"He’s got a swing-and-miss slider, his changeup is pretty decent, and his fastball can get up to 95 [miles per hour]," Girardi said. "We like what we've seen."

Chris Nelson will also don the pinstripes for the first time on Friday. The Yankees acquired the 27-year-old infielder from the Rockies on Wednesday, for cash or a player to be named later.

Nelson was batting .242, with no home runs and four RBIS, in 21 games (66 at-bats) for Colorado. Last season he hit .301, with nine home runs and 53 RBIs, in 111 games (345 at-bats).

Girardi said Nelson will be used primarily at third base, but he can also play second.

TEX UPDATE: Mark Teixeira hit off a tee and took soft toss in the cage for the third day in a row on Friday.

"Very excited," Teixeira said. "I feel like I got over the hump with the last few, hitting soft toss. It's been really, really good to kind of let it go, and feel the ball off the bat."

Teixeira heads to Tampa on Sunday to continue his rehabilitation. He expects to begin outdoor batting practice within the next couple of days -- the next phase in his rehab.

He wouldn't venture a prediction on when he will be back, but when asked if he thinks he can return before June 1, Teixeira said, "I hope so. Absolutely I hope so. But we'll see."

DRAFT ORDER: Major League Baseball has released the selection order for this year's first-year player draft, and the Yankees are the only team with three first-round picks.

The Yankees own the No. 26, No. 32 and No. 33 selections. The latter two are compensatory picks for losing free agents Nick Swisher and Rafael Soriano. Those will be the final two picks of the first round.

The three-day draft begins on Thursday, June 6.