Blues and Forest played out a goalless draw at The City Ground on Saturday and will replay at St Andrews on 12th January.
The winners have an away tie against Everton in Round Four on the weekend of 23rd/24th January.
Full Fourth Round Draw:
Tottenham v Leeds United
Tranmere/Wolves v Crystal Palace
Aston Villa v Brighton
Preston v Chelsea
Portsmouth/Coventry v Sunderland
Bolton v Sheffield United/QPR
Accrington/Gillingham v Fulham
Everton v Nottingham Forest/Birmingham
West Brom v Plymouth/Newcastle
Scunthorpe United v Manchester City
Notts County/Forest Green v Wigan Athletic
Stoke City v Arsenal
Bristol City/Cardiff City v Leicester City
Millwall/Derby v Brentford/Doncaster
Reading/Liverpool v Burnley
Southampton v Ipswich