Some of those receiving added responsibility include David Backes, Anders Bjork, and Joakim Nordstrom.
"We talked about [David Backes] being on the power play at least for now. It's the least disruptive to that group, putting his right stick in there [for Bergeron as the bumper]," said Cassidy. "And then in the forward lines we moved [Anders] Bjork up from [Jakob Forsbacka Karlsson's] line from Colorado, so he got to play more top-six.
"[Joakim Nordstrom] had to go to the middle - but Nordy plays a lot for us anyway no matter what. He'll move around, play different spots. I guess Bjork, 5-on-5, might benefit a little bit.
"We'll see how it all plays out. It might be a night-to-night basis, who goes where, certain matchups. We're gonna have to manage it until we figure out who best fits where."
Despite all of the moving parts that come with the absences of the team's two most important leaders, Cassidy does not expect his players to alter their approach.
"I don't think you want to change the way you play, you just have to be cognizant that players going in aren't Bergy or Zee," said Cassidy. "They have to be their best selves and maybe you've got to spread out minutes a little more, you've got to be a little more locked into matchups. And part of it is you just have to let the guys play."
Cassidy specifically pointed to the play of Jeremy Lauzon as a prime example of someone taking advantage of the opportunity he's been presented. The 21-year-old was first recalled in late October, playing four games and averaging just under 12 minutes of ice time on Boston's third pairing.
Following an injury to Brandon Carlo during the last homestand, Lauzon was summoned from Providence once again. And after the subsequent injuries to Chara and Moore, the former second-round pick has quickly earned the trust of the coaching staff and has played at least 21 minutes in each of the last three games - with a career-high 24:52 in Dallas.
"I think Lauzon is a good example of that," said Cassidy. "He's gone in and we've just tried to let him play his game. He's big, he's long - he's not Chara long, but he can fill in some of areas that bring some of the things Zee does.
"Competes hard like Zee…left shot, so he's played against other teams' best players, so we've kind of plugged him in there."