Torre had planned to sit the right fielder in the series finale in Milwaukee on Wednesday, but decided to play him because New York was facing left-hander Chris Capuano.
"It's just a day off," Torre said. "I promised myself -- and I told him -- that I'd pay more attention to his needs, even though he won't call them to my attention."
Giambi, who played a big part in the Yankees' defensive breakdown on Friday night, was back at first base after being benched for Tino Martinez on Saturday.
Torre said that Giambi, who is 5-for-22 on the trip, remains an integral part of the Yankees' lineup, saying he "figures to be the main guy" in the first base/DH mix.
"When we get back to the American League, he'll be in [the lineup] without anybody questioning it, but I still think we have to get him his at-bats," Torre said. "His upside is very high, and Tino is here as a backup player. He's had more playing time than we anticipated at this point."
Sanchez still out: Rey Sanchez, who was diagnosed with two bulging discs in his neck on Saturday, was unable to play again on Sunday, and a trip to the disabled list is looking probable.
"We're going to have to make a decision here," Torre said. "If he's not going to be a player here for us the next few days, we may have to do something."
Should Sanchez land on the DL, the Yankees would call up infielder Felix Escalona from Triple-A Columbus. Escalona is batting .274 with seven home runs and 29 RBIs for Columbus in 59 games this season.
Womack unhappy? Tony Womack was seen having a conversation with general manager Brian Cashman after the game, though neither man would comment on the subject of their talk.
"Just a conversation," Womack said.
There has been some speculation that Womack, who was moved from second base to left field in early May, could be traded. Womack has made it clear that he still considers himself a second baseman, though the Yankees don't appear to have any plans to take that job away from rookie Robinson Cano.
Before Sunday's game, Womack, who played second base for the Cardinals last season, received his National League championship ring in an on-field ceremony. Several of Womack's teammates from the 2004 Cardinals stood on the field as he received the ring.
Sierra stiff: Ruben Sierra was battling a stiff neck on Sunday, the result of a bad night of sleep at his hotel.
"The bed at the hotel is not good," Sierra said. "I like hard pillows; these are soft. I am OK; it is just stiff."
Sierra pinch-hit on Sunday, striking out against Julian Tavarez for the final out of the eighth inning.
Another honor: Torre was presented with a miniature model of Busch Stadium on Sunday before the game, as the Cardinals are honoring a player or representative from each team during its last game at the ballpark.
Torre, who tore down the countdown number in the outfield on Saturday, has been received warmly all weekend by the St. Louis fans. He played six seasons for the Cards and managed the club from 1990-95.
"I didn't expect that kind of reaction," Torre said. "It was very moving."
Previous recipients of the stadium model include former Cardinals pitcher Woody Williams, now with the Padres, and the Phillies' Jim Thome.
Gordon OK: Tom Gordon avoided injury when he was hit on his right index finger by a batted ball in the eighth inning on Saturday.
Torre said before Sunday's game that he would try to give the right-hander the day off, but he wound up pitching the eighth, sitting the Cards down in order.
On deck: After an off-day on Monday, the Yankees return home on Tuesday for the first of three games against the Pirates. The game kicks off a 13-game homestand for the Yankees, who are 16-13 at Yankee Stadium.
Mike Mussina gets the ball for the Yankees, while Kip Wells takes the mound for Pittsburgh.