Matt Grzelcyk did not skate with the team on Monday morning. Cassidy said the blue liner sustained a lower-body injury in the game against Montreal but played through it. Jeremy Lauzon was once recalled from Providence on an emergency basis.
"[On Sunday], he did not feel great," said Cassidy, "Today couldn't practice, so he's doubtful for tomorrow. We'll have to see how he is…if Grizz recovers well enough to play tomorrow then we'd look at putting him in for, I guess you'd say, [Jeremy] Lauzon or [Steven] Kampfer.
"We'd have to decide what's the best fit for our lineup. Obviously Kampfer being a right shot probably keeps him in."
Charlie McAvoy skated on Friday before practice, but did not hit the ice on Monday.
"Obviously not skating and he's not going to play tomorrow," said Cassidy. "We know that, so I guess we keep pushing him down the road a bit for now. He skated the other day, so I'm not sure if this is planned or a setback, but if he doesn't skate tomorrow then clearly he's had a setback because usually they'll only keep you out for a day or two."
Finally, David Backes was back skating full-contact with the team, but will not play in Tuesday's game in North Carolina, making Saturday's game in Nashville the next target return date.
"I think with David we want to make sure," said Cassidy. "We don't want to send him back in there until he's 100 percent ready, so that'll be a mutual decision between the medical staff and player."
With Saturday as a goal, Backes will have some added practice time with the team before the Bruins face off against the Predators.
In addition to Lauzon, center Colby Cave was also recalled from Providence on an emergency basis. Cave leads Providence in scoring this season with five goals and five assists for 10 points with a plus-3 rating.