updated 3:52 p.m. ET March 28, 2008

TAMPA, Fla. - Yankees left-hander Andy Pettitte threw 25 pitches off a bullpen mound Friday and remained scheduled to pitch in a minor league game Sunday.

Originally slated to start the Yankees’ second game of the regular season, Pettitte has been slowed by back spasms. He could make his first start Friday or Saturday.

“As far as during my bullpen and stuff like that, I feel great,” Pettitte said. “It loosened up good. Do I still feel it walking around? Yeah. Sunday is a good day. I need to get some good work in. That’s all I’m looking for now.”

Pettitte hasn’t pitched in a game since March 17.

In other news, left-hander Sean Henn, who will start the season on the 15-day disabled list with tendinitis in his throwing shoulder, struck out one and walked one in a minor league game.

Humberto Sanchez, coming back from elbow ligament replacement surgery, will throw off a half-mound for the first time Tuesday.

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