Without discussing the severity of the injury, general manager Darcy Regier provided the update shortly before the start of the game. Regier said there's a possibility Miller could be back by the weekend, when the Sabres play at Washington on Saturday and Carolina on Sunday.
Last year's Vezina Trophy-winner was shaken up in the third period of a 4-3 loss at Toronto on Tuesday night, when he took a hard shot from Maple Leafs defenseman Dion Phaneuf. After gloving the puck to stop play, Miller was attended to by a Sabres trainer and was able to complete the game.
Regier would only say that Phaneuf's shot "played a role" in the injury.
Miller was also struck in the mask by a shot from Brian Rolston in a 2-0 win over New Jersey on Saturday.
Miller is 33-22-8 this season, and has played a key role in helping the Sabres go 24-11-5 since Dec. 28 to climb into playoff contention. With 11 days left in the regular season, Buffalo opened the game against New York holding the Eastern Conference's eighth and final playoff spot, three points ahead of Carolina and two behind the Rangers.
Miller was particularly sharp last week, when he won three games, including two shutouts, and was named the NHL's first star.
Jhonas Enroth made his first start since a 6-4 win over Ottawa on March 13. Enroth has a 5-2-1 record this season, and has been with the Sabres since being recalled from AHL Portland earlier this month.