"He's not available to play today," coach Lindy Ruff told reporters. "Just day-to-day right now."
Miller reported feeling tightness in his lower body Monday and sat out practice as a precaution. He practiced Tuesday and said he felt better, and was on the ice for Wednesday morning's practice, but mostly stretched and watched as backup Patrick Lalime and Jhonas Enroth, who was called up from AHL Portland, were in the goals.
Ruff would not reveal who his starting goaltender Wednesday night would be, and both goalies left the ice at the same time when practice ended.
"The numbers speak for themselves," Ruff said of Lalime. "I thought he got off to a good start in the Dallas game. A tipped goal goes in, a screened goal goes in. I think there's been goals that there's not a thing you can do about."
Enroth, a 22-year-old second-round pick in 2006, is 4-2 with a 3.51 GAA and .895 save percentage in seven games with Portland. He made his NHL debut last season, stopping 33 of 37 shots in a loss to the Bruins.
One player the Sabres will have in the lineup is Jason Pominville, who will return after missing nine games with a concussion suffered Oct. 11. Also back in the lineup will be defenseman and team captain Craig Rivet, who had been a healthy scratch the last two games.
Opposing the Sabres on Wednesday will be Bruins goalie Tim Thomas. The NHL's Second Star of the Month is 6-0-0 with a 0.50 GAA and .984 save percentage.