McDonagh suffered a separated shoulder in the first period of Saturday's game against the Jets, ESPN New York reports. McDonagh missed the final five games of the regular season last year with a left shoulder separation, and this injury is to the same shoulder. The Rangers' blue line is depleted right now, with Kevin Klein (foot) going down with an injury Saturday and John Moore serving a five-game suspension. New York has not yet announced a timetable for how much time McDonagh might miss. He will be re-evaluated Sunday.