Soderberg, recovering from an ankle injury, skated with the team Saturday morning but afterward was unsure if he would be in the lineup or not.
"I have no idea," he said.
His coach wasn't offering any answers either.
"I haven't told anybody yet if Soderberg is in the lineup," Bruins coach Claude Julien said. "That's why the players don't know. I haven't made that decision yet."
Julien said he won't make that decision until shortly before the puck drops.
"It's a difficult decision as to who to take out," he said. "It's pretty obvious that it is not an easy decision but you better make those decisions come game time, right?"
The Lightning will be seeking their sixth win in their past seven games after defeating the Minnesota Wild 3-1 on Thursday behind Steven Stamkos' 30th career game-winning goal and some sharp goaltending by Ben Bishop.
Tampa Bay will have the chance to avenge one of their two losses this season, a 3-1 loss to the Bruins in their season-opener, a game that saw the Lightning allow the Bruins to score two shorthanded goals and another on a penalty shot.
"That first game set the tone for our season so far, even though we lost," Lightning coach Jon Cooper said. "We gave up a penalty shot and our special teams kind of came unglued a little bit, which I feel like we've progressed, but I felt like we weren't far off. I just had the feeling that we had a big-time test, and although we didn't get the two points we came for, I learned a little bit about our team and it has carried on so far and it's probably why we are winning."
Julien said he is aware of the success the Lightning have had since the teams met Oct 3 in Boston.
"Their whole game seems to have picked up," he said. "When you're winning there is more of a positive energy around your dressing room and I think that feeling is there for the Lightning now and just watching them play, they seem to be playing with a lot of confidence. I think that's where the big difference is."
Bishop has been off to a great start, winning all five of the games he has started with a 1.57 goals-against average. But the St. Louis native had another team on his mind today; his hometown St. Louis Cardinals beat the Los Angeles Dodgers on Thursday to advance to the World Series for the fourth time since 2004.
"It's huge," Bishop, a big Cardinals fan, said. "I'm really excited. You do get kind of get spoiled."
Here are the lineups each team likely will use Saturday:
Injured: Tom Pyatt (collarbone)