View Photo Gallery: Washington drops the opener of its Eastern Conference semifinal series after giving up two goals in a 90-second span.

Ryan Callahan said Monday morning that the New York Rangers must guard against another Game 2 letdown.

In game 2 of their first-round series against Ottawa, Callahan and his teammates surrendered a pair of one-goal leads on home ice before falling in overtime, 3-2. Instead of taking a two-games-to-none series lead, the Rangers headed to Ottawa tied at a game apiece and wound up needing seven games to eliminate the Senators.

“We have to be ready for it,” Callahan said after the morning skate at Madison Square Garden. “Try to come out better. They’re going to be better. The big thing last series was we let that second one get away from us at home. We have to be sure we bring the same intensity, the same level of compete, if not better.”

Goalie Henrik Lundqvist agreed.

“We need to win this one,” he said. “We need to have the same desperation we had last game. They’re going to come hard. In the playoffs, if you lose one, you try push yourself in the next game. So we have to expect them to be really good tonight and we have to respond.”

The only lineup news surrounded the health of forwards Brian Boyle and Brandon Dubinsky.

Boyle, who has missed the past three games bcause of a concussion, participated fully in the morning skate and afterward said he would wait until later in the day before deciding whether to suit up. If Boyle plays, he could skate on the third line.

“This is my first time going through it,” Boyle said. “It’s my call, I think. I’ll let them know them know when I’m ready to play and then after that, I’m back in the lineup. It’s tough to say right now. . . . I think I’m all right. I’m new to this.”

Dubinsky, meantime, has a lower body injury and was on crutches Sunday. He’s not expected to play in Game 2.

More notes from the Rangers’ side of the rink in just a bit.