Savard underwent an MRI Friday, however, according to the Boston Globe, the team won't announce the results until Saturday. The Bruins have already ruled Savard out of Saturday's matinee against the Rangers.
Savard has nine goals and 13 assists this season. He also missed 15 games early in the season because of a broken left foot.
It was the third straight game that Boston has lost a key player: On Monday, Patrice Bergeron broke his thumb, and Andrew Ference hurt his groin on Tuesday. But the Bruins did get Milan Lucic back from a left ankle sprain that has kept him out since Nov. 25.
"It's not an easy task, and we were exposed a little bit tonight," coach Claude Julien said after the 5-2 loss to the Chicago Blackhawks, while insisting that the team would not use injuries as an excuse. "I don't care what happens, it will never be because of injuries. But let's be honest and realistic: Injuries are making it hard to do what we're trying to do."
ESPNBoston.com's Matt Kalman and the Associated Press contributed to this story.