"Ryan will not be available [Monday or Tuesday, at the Florida Panthers]," Ottawa coach Paul MacLean said. "He has re-aggravated something and right now we are going to keep him out for two games and evaluate him when we get home and make any more determinations after that."
Stepping into Ryan's spot will be forward Mark Stone, called up from the American Hockey League on Saturday.
The Lightning head into the game in an enviable position: Everyone on their roster is healthy.
"It's good," Lightning coach Jon Cooper said. "It's much better than not being healthy, that's for sure. The one big key is that Steven Stamkos is getting better with each game so that helps, and we're finding a little bit of consistency in our lines and we're getting production from some of the guys who have sat out a little bit and now are back in. Everyone's chipping in."
One player that will get an opportunity to make a contribution against Ottawa is rookie forward Nikita Kucherov. A healthy scratch for five consecutive games, Kucherov got the word he is in the lineup from Cooper at the morning skate.
Sitting out is a part of Kucherov's development, Cooper said, and the coach remains optimistic about his long-term prospects.
"He's 20 years old, so he has taken a huge step just to play as many games as he has," Cooper said. "He is learning about the NHL. Kucherov didn't have the luxury of playing in the AHL for two or three years; he played 15 games in the AHL. So he's still learning. Everything he is doing is two thumbs up from me.
"I'm really happy with where he has been and I'm really happy with what's going on, and he will be a really good player in this League."
Here are the projected lineups for the Senators and Lightning:
Injured: Bobby Ryan (lower body)