Cassidy said Noel Acciari (lower-body) and Anders Bjork (upper-body) would remain out of the lineup on Thursday against St. Louis. Bjork is expected to be sidelined through at least the weekend.
For Acciari, who has missed the last two games, the issue is one of pain tolerance, according to Cassidy.
"Trust me, he can take a lot of pain," said Cassidy. "He's just trying to get to a good spot with it…until he does, we don't want to put him out there. He played through it through the Islanders game, he had a tough time with it. We had to shut him down for a stretch of time.
"We want to try to get him to be as healthy as can be with the injuries. Certainly will have to play through aspects of it."
Prior to sitting out, Acciari was struggling with his skating game, which is critical to a player who has become one of the most feared body-checkers in the National Hockey League.
"A lot," Cassidy said of how much the injury hampered Acciari's physicality. "He gets there and finishes hard, so without losing a bit of that ability, that's a big part of his game that he lost.
"He was good on the walls, good in front of the net. When he was static, he was still good. But to be able to close and finish and eliminate, that's where it's affected him."