"I'm obviously disappointed," Teixeira said. "I don't want to miss any time, but it is what it is. I can't really change it, so we'll just keep working hard and try to get out there as soon as possible."
After sitting out for 10 games, Teixeira tried his luck in the lineup and reinjured his calf trying to beat out a ninth-inning double play at first base in Saturday's 5-4 loss to the Orioles.
An MRI exam taken on Monday in New York revealed that Teixeira had irritated his original Grade 1 strain, and the Yankees said that Teixeira is now forecast to miss a minimum of 10-14 additional days.
"It's pretty much what I expected," manager Joe Girardi said. "I saw him after the game [on Saturday] and he was limping a little bit an hour after the game. It kind of reminded me of what he was going through when he first hurt it. I expected it to be probably two weeks."
Teixeira said that he thought his calf was better than 80 percent when he returned to the lineup, and that the new injury means he will have to be more careful about trying to hurry back. Teixeira said he can continue to travel with the team, and he is currently limited to icing and ultrasound treatment.
"A calf doesn't seem like it's something that you can play on 80 or 90 percent," Teixeira said.
With Teixeira out, the Yankees plan to have Nick Swisher play first base against right-handed pitching and Steve Pearce in the lineup against lefties. Teixeira is hopeful that he will be available for any potential Yankees postseason games, but he said there are no guarantees.
"I'm confident that I'm going to work as hard as I can to try and play again," Teixeira said. "I really have no idea. I wish I had the crystal ball to tell you when I could play. I just don't have it."