Grossman, 27, a second-round draft selection in 2004, should be in the lineup Saturday against Pittsburgh. He is a stay-at-home defenseman who is difficult to play against.
Grossman has averaged about 19 minutes a game and blocked a team-high 100 shots this season. The blocked-shots total would place him third on the Flyers. He had five assists and was even in plus-minus.
After the season, Grossman ($1.625 million cap hit) can become an unrestricted free agent.
Asked if it was unlikely he would make a major move before the Feb. 27 trade deadline, Holmgren paused for a few seconds.
"Unlikely? I don't know if I'd use that word, but it's probably not something we're talking about at length," he said. "I like our team. We've struggled here of late. We're trying to get it figured out. I think adding Nick is going to help us, and we'll see what the next 10 days and two weeks brings."
Used on Dallas' penalty-killing and power-play units, Grossman will give the Flyers some much-needed physicality.
Entering Thursday, the Flyers' penalty-killing units had allowed five goals in the last two games.
"We've struggled in a lot of areas here lately. That's certainly one of them," Holmgren said. "Nick has developed over time there in Dallas. He's still a young player. He's a good young player. We're excited. He's going to give us a boost here and get us out of our end quickly. He's got a good first pass."
Holmgren was asked about the Flyers' lack of physicality on defense.
"Since the lockout, the game has changed. For defensemen, it's very difficult to defend in front of your net," he said. "If you knock somebody down, a lot of time you're going to the box. A lot of our guys are more containment-type defensemen. They've never really been Chris Prongerish, where they're going to whack somebody.