Midfielder Fahey returned from a lengthy absence due to compassionate leave to put in positive displays at Middlesbrough and Crystal Palace, where he was duly forced off with a troublesome hip injury and missed Monday's 3-2 home defeat to Wolves.
The Irishman is now likely to be on the sidelines for the remainder of the season as Blues look to get to the bottom of the problem.
Winger Burke has missed the last two games due to ankle problem sustained in training and will again sit out, but fellow midfielder Spector could return from an ankle injury of his own and faces a race against time to feature against the Lions.
Marlon King, Stephen Carr, David Murphy and Will Packwood all remain unavailable due to injury as 11th-placed Blues aim to stretch the five-point gap that currently exists to the bottom three amid what is an extraordinarily congested battle to avoid relegation.
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