Birmingham City are set to tie up a deal for the midfielder on Monday but he would have to have been signed before the original FA Cup tie to be considered.
Blues boss Alex McLeish has kept the same side throughout their excellent recent run in the Premier League but made changes for the City Ground clash and is set to do so again at St Andrews, especially given the tough clash with Manchester United on Saturday evening.
Forest have had extra time to recover from their weekend fixture, having played on Friday night against West Brom.