Callahan, who was injured during a fight in the third period of the Rangers' 2-1 win, underwent an MRI earlier on Wednesday and was examined by a doctor, the team said in a statement.
According to the Rangers' timetable, Callahan is likely to miss anywhere between four and seven games over 10-14 day period.
Callahan, who is tied for second in the NHL with 27 hits and sixth among league forwards with nine blocked shots, has two goals in six games this season for the Rangers (3-3).
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