The Black Cats drew there 5th Round tie with the Blues 1-1 at the Stadium of Light, Forssell gave the visitors the lead but Kevin Kyle soon equalised.
This tie now means that the game with Derby County at Bramall Lane on 6th March will now be postponed.
Cup holders Arsenal will face either Liverpool or Portsmouth at either Anfield or Fratton Park.
Full Round Draw:
Millwall v Tranmere Rovers
Manchester United v Fulham or West Ham United
Sunderland or Birmingham City v Sheffield United
Liverpool or Portsmouth v Arsenal
Ties to be played on weekend 6th and 7th March 2004, all the games will be shown on Live TV.