Leddy wasn't on the ice for Wednesday's practice session due to a lower-body injury, Matthew DeFranks of the St. Louis Post-Dispatch reports.
Leddy hasn't been ruled out versus the Islanders on Thursday yet but could still be held out. The fact that the Blues are carrying eight defensemen on their 23-man roster might also factor into the decision to put Leddy on the shelf for a game even if his lower-body injury is deemed minor. Pierre-Olivier Joseph appears to have the inside track for replacing Leddy if necessary, though Scott Perunovich is also waiting for an opportunity to play.