"He got injured in the early stages of training on Thursday," manager Alan Irvine told the club's official website. "It looks like he will be out for two or three weeks.
"With only six defenders to cover four positions it seems we were always likely to be in this position, leaving us vulnerable to injuries and suspensions.
"We have two defenders injured now and the great thing about Eddie Nolan (who signed on loan from Preston on Friday) is that he can play across all four positions in the back four.
"We've got a few injuries and that in a small squad has proved to be costly."