BOSTON -- A right leg bone bruise initially expected to keep Mark Teixeira out a maximum of 10 days may sideline the 35-year-old several more weeks.

Teixeira had a second MRI on the affected area in New York, with the test showing "the extent of the bone bruise is more than we thought," manager Joe Girardi said on Tuesday, adding the veteran will be on crutches for at least "a few days."

The positive news is that the MRI did not show a fracture, but that was all on the good-news front.

"His bone bruise has not healed at all," general manager Brian Cashman said. "There is no stress fracture. That was the biggest worry because he hasn't responded to it. But the bone bruise has not healed in any way, shape or form. He has some soft-tissue inflammation and some inflammation around the nerve. So he received some sort of injection to calm that down. But obviously, the bone bruise is the big issue and there's been no healing . . . He was on crutches initially and came off because he felt better. But they're putting him back on crutches and we're looking at weeks."

Teixeira left the Aug. 17 game against the Twins after fouling a ball off an area below his right knee. He had an X-ray, CT scan and MRI the next day and was given 7-10 days out as a worst-case scenario.

"He's going to be down for clearly an extended period of time," Cashman said. "They've ruled out any other complications. And it's a timing mechanism and it's just taking a hell of a lot longer than anybody would have expected."

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So it is what it is. There's nothing he can do about it, there's nothing we can do about it to speed the process up. Whatever can be done is being done."

Lefthanded-hitting rookie first baseman Greg Bird has filled in for Teixeira and done reasonably well, his rough game Monday night notwithstanding.

On Monday, Cashman all but dismissed the possibility of Alex Rodriguez getting some time at first with Teixeira out, saying Chase Headley would be the far better option.

But Girardi believes differently, citing numerous lefthanders the Yankees will face the next month, focusing likely on Toronto's David Price and Mark Buehrle in particular.

"I think our hope was that when we left on that road trip , that you would have Tex back by the time we got home, or even on the road trip," Girardi said. "But now I think you have to think about it because you're going to see lefthanders. There's lefthanders in our division and we're seeing a lot of division opponents in the next 32 games, so I think you have to start debating the idea."

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Cashman, speaking on Tuesday after Girardi, did not back off his opinion, even citing the recently brought up Dustin Ackley and Austin Romine as his preferred first-base fill-ins.

"I don't feel like he's a real option over there," Cashman said of A-Rod, who Monday intimated he didn't want to see time at first. "I think that from a field side, from Joe's side, having as many insurance policies lined up makes sense. I get that. But would I actually see him going over there? I don't . . . Alex is a huge bat, if he could do first, I just don't think he can, personally. Everybody has opinions. I just don't think he can play first myself."