Getting sat out in an elimination game, he added, wasn't the best time for the first one.
Giroux was suspended for Game 5 as punishment for his hit to the head of New Jersey's Dainius Zubrus late in the second period of Game 4 on Sunday.
"It's obviously not easy," he said of sitting out. "You want to be there to help the team win. But I've got a lot of confidence in the guys that are going to go out there and get the win. After that, we're going to have to go to Jersey [for Game 6] and come back for Game 7 here."
Giroux said he didn't think he would get suspended, but now that the decision is made, he said his focus has moved to getting ready for a hoped-for Game 6.
"Obviously I hit his head with my shoulder, but I still think I didn't jump," he said. "My elbow was down. That wasn't my intention to hit his head. Obviously it's disappointing to see that I can't go on the ice and help the guys win this game tonight. But all I got to do is focus for Game 6 now.
"I didn't think I was going to get suspended, to be honest. I think they want to get hitting to the head out of the game, and I respect that. There's nothing I can do about it now. Obviously, I can't play tonight and it's frustrating."
Giroux said he spoke to a few of his teammates but said he didn't feel he needed to give any motivational speeches.
"Talking to the guys, they look pretty confident," he said. "Everybody wants to win. That's pretty clear. Just [stinks] that I can't do anything about it. I have no control over the game tonight. I've got to make sure I'm ready to go for Game 6."
Contact Adam Kimelman at email@example.com. Follow him on Twitter: @NHLAdamK
You get the right the whistles at the right times, you can leave him out there. He's a beast when it comes to being on the ice. I thought [Saturday] he was a big man. That first period, he did that lateral cut and it was like three bowling pins bounced off him. There's not too many guys that can do that.
— Capitals coach Barry Trotz on Alex Ovechkin, who enters February tied for the NHL lead in goals