Blues' away game against Palace was postponed on Tuesday because of the adverse weather conditions and was rescheduled for 14th February had Forest progressed to the fifth round of the FA Cup which take place that same weekend.
However, Forest were knocked out of the competition in their fourth round replay against Derby County on Wednesday night and so Blues will now be playing them at St Andrews as planned on 14th February.
The away fixture against Palace has been rescheduled for Tuesday, 24th February but that could also bE changed dependent on FA Cup 5th round tie results.