Boucher said that if Smith or Ryan miss extended time, he could call on forwards Tom Pyatt or Chris Kelly, or defenseman Chris Wideman.
"It's more about who's going to play and who's ready to play, and I have all the confidence in the world that the players will bounce back," Boucher said.
Game 4 is here Thursday (7:30 p.m. ET; NBCSN, CBC, TVA Sports).
"We didn't start well enough, plain and simple," Ottawa defenseman Dion Phaneuf said. "If you don't start on time, you get behind. When you get behind, you chase the game, and we seemed to chase to game. We have to start a lot better; the start cost us the game. They played well and more desperate than us. The Rangers found a way to get to a higher level, and that's not acceptable."
The Senators found themselves in a similar predicament in Game 2 during the second period, when the Rangers scored three goals on 19 shots to take a 4-2 lead. In that game, however, Ottawa settled down, tightened up defensively, and eventually won 6-5 when center Jean-Gabriel Pageau scored his fourth of the game 2:54 into the second overtime.
The Rangers weren't going to allow a repeat Tuesday.