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08/29/10 7:20 PM ET

Teixeira's bruised thumb has him day to day

CHICAGO -- Mark Teixeira was scratched from Sunday's lineup because of the bone bruise in his right thumb suffered on Friday night.

Manager Joe Girardi originally had Teixeira in his customary third spot in the order, acknowledging that it was a "wait-and-see" approach during pregame warmups. But after stretching with the team, Teixeira had difficulty even picking up a bat without pain, and so decided to wait at least one more day.

"It didn't feel good, so I figured it'd be best to give it a rest and hopefully it feels better tomorrow," Teixeira said after the Yankees' 2-1 win.

Teixeira suffered the injury on Friday night, diving for a ball down the first-base line in the fifth inning. He stayed in that game for a pair of at-bats, and he said the thumb didn't start bothering him until Saturday morning. He started Saturday's contest, only to exit after two innings.

He said on Sunday that it didn't feel that much better from Saturday.

"Maybe a little better, but not much," he said, while maintaining that it won't be a long-term issue. "I'm definitely day to day."

"Day to day, we'll see how he feels," Girardi said. "Hopefully it's not as sore tomorrow. If he needs another day, he needs another day."

With Teixeira out, Nick Swisher moved from right field to first base and up to the three-hole, with Austin Kearns taking over in right field.

Sunday marked the first game this season Teixeira missed due to injury. It's only the third time this year he wasn't in the starting lineup, with the other two coming because of the birth of his son earlier this month.

Pettitte throws again, happy with arm

CHICAGO -- Andy Pettitte was pleased with his second bullpen session in Chicago, saying he increased the intensity and that his arm feels "like a nine."

Pettitte threw 35 pitches in the bullpen prior to the Yankees' rubber game with the White Sox. That's 10 more than he threw on Friday, when the left-hander admitted he had to hold back in testing his strained left groin. Pettitte said that his final 20 pitches on Sunday felt pretty much like a normal, healthy bullpen session.

"I heated it up pretty good," Pettitte said. "It was a good day, with a lot more intensity than I threw with on Friday."

Pettitte said he was able to push himself a little more than he expected to, thinking earlier that it would take a third bullpen session to reach this point. He admitted that he was tentative with his first few curveballs but gained confidence once he started throwing the hook with authority.

"That's really encouraging," said manager Joe Girardi. "You hear the reports, but I wanted to look him in the eye. He was excited."

Girardi expects Pettitte to throw another bullpen on Tuesday or Wednesday back in New York. From that point, the schedule becomes murkier.

Pettitte could then throw a simulated game or head straight for a rehab assignment before the Minor League regular season ends during the first week of September. Still, the left-hander estimated that the quickest he could be back is in two weeks.

"That would be good," Pettitte said of that timetable. "It just depends on what they want me to do."

"That sounds about right," said Girardi. "As long as we don't have any setbacks, that's realistic."

Girardi added that he would probably work Pettitte back into the rotation gradually, keeping him on a lower pitch count in his first start back. That said, he won't hesitate to hand the ball to the veteran in a key September showdown.

Pettitte himself maintained that stamina is still one of his biggest concerns. During the latest stage of his recovery, he hasn't done any real running or weightlifting with his legs, focusing on getting in pitching shape.

"I'm going to get in shape as far as pitching shape. I'm definitely going to pay for it a little bit stamina-wise," Pettitte said. "For right now, I'm just going to stay locked in to what I'm doing, even though I hate it. I feel like I've put on five pounds."

Worth noting

Alex Rodriguez is planning to hit before Monday's game with the Athletics at Yankee Stadium. Manager Joe Girardi said he expects Rodriguez to be activated the day he's eligible to come off the disabled list, a week from Sunday. ... Nick Swisher is 9-for-22 against his former team this season, with homers in each of his past four games against the White Sox. ... The hot streaks of Marcus Thames and Eduardo Nunez mean that both earned rare starts against a right-handed starter on Sunday. ... The Yankees were going for their eighth series win in 10 tries against AL Central opponents in Sunday's rubber game. ... The White Sox celebrated Frank Thomas Day on Sunday, retiring the Big Hurt's number in a ceremony prior to the game. "An extremely selective hitter that was very productive," Girardi said of Thomas. "Dangerous, dangerous, dangerous."

Tim Britton is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.