Tanguay has not played since a 4-1 win against the Montreal Canadiens on Nov. 2. He left the ice in the second period of that game after falling into the boards following a collision with Montreal defenseman P.K. Subban.
"He's out indefinitely for us right now," Roy said following practice Saturday. "It's hard to pinpoint when he's going to come back."
The Quebec native was scheduled to have an MRI exam on his knee two weeks ago but Roy did not reveal any details about the injury.
In 12 games this season, Tanguay has three goals and nine points.
I don't have a crystal ball. Predicting is a real complicated thing. If we stay healthy, have enough depth and get the good goaltending we think we're going to have, you can go all the way. But a lot of things have to happen. There's going to be a lot of teams that think the same thing. Everyone made deals. We're all are optimistic about where we'll end up.
— Rangers general manager Glen Sather after being asked if he's constructed a team that can win the Stanley Cup before their 4-1 win against the Predators on Monday