"He tried to skate [Wednesday] and kind of had a tough time," Cassidy explained. "[Thursday] morning, we didn't go on the ice - only a couple guys went on, so we were going to see today when he got to the rink how he was. It hadn't progressed very well, so we weren't going to push it.
"I've said this before this year, I don't think it's anything major. I don't - and that's our official reports from the doctors. This isn't me just making crap up, but it may be a couple days. He might be ready Saturday. It might be a week.
"But I don't believe it's anything noteworthy that's going to keep him out for an extended period of time."
DeBrusk has been, arguably, the Bruins' hottest player over the last three weeks with eight goals and 15 points in his last 10 games.
Forward Karson Kuhlman was recalled from Providence on an emergency basis and played the right wing alongside David Krejci and Peter Cehlarik, who took DeBrusk's spot on the left side.
