"I think we want to sit down with him and figure out what might be the best way to go forward," said manager Terry Francona. "Whether it's in five days or giving him a couple extra days, we can do that with a day off on Monday, so we'll talk to him."
Buchholz allowed a season-high six runs in 4 2/3 innings to the A's on Friday night, and while his back didn't tighten up on him as it did in his previous start, it was on his mind.
"I felt it a little bit," said Buchholz, who saw his ERA rise to 3.82. "It might have been something that was in the back of my head, trying not to do too much where I'd tweak it and hurt it again. But I felt the same as it has all season so far."
Tim Wakefield threw a bullpen session Saturday afternoon and would be available to start in place of Buchholz in New York on Wednesday. Alfredo Aceves, who has made three straight starts, is available out of the bullpen.