Ryder, who practiced Friday, stayed in Montreal to receive treatment.
"There were too many question marks," Canadiens coach Michel Therrien said. "We feel it's better for him to treat it and resolve the problem. When we put him back in the lineup he's going to be 100 percent. At this time of the year we don't want to take any risks.
"It's not like a major injury, but it's something we have to pay attention to."
Ryder will be replaced in the lineup by Mike Blunden, who was recalled Friday from the Hamilton Bulldogs of the American Hockey League. Travis Moen will move up from the fourth line to play on the top line with Tomas Plekanec and Brian Gionta.
Blunden had quite a trip just getting to Newark.