Larsson has missed Blues' last two games with a groin injury whilst McFadden has been forced to sit out three matches with a similar injury.
However, manager Alex McLeish has confirmed that both players have trained for all of this week without any adverse effects and are likely to return to his squad for the live television game against Steve Coppell's side at St Andrews on Saturday lunchtime.
Club captain Damien Johnson could also be named in the squad again after he came through ninety-minutes of a friendly game against Cheltenham Town on Tuesday.
Johnson is yet to play a first team game this season having undergone back surgery in the summer.