Princeton forwards Andrew Ammon and Will Ford suffered lower-body injuries, the team said.
There is no timetable for their return.
The team said Ammon and Ford sat out in Princeton’s 1-0 exhibition loss to the University of British Columbia so as not to aggravate the injuries.
Ammon leads Princeton in goals with six, and his eight points are tied for second. He is one of five Tigers who has appeared in all of Princeton’s regular-season games this season.
The senior recorded game-winning goals in two of Princeton’s three victories this season.
The Tigers return to ECAC action on Jan. 10 when they host RPI.