Saturday's draw saw City come out of the hat first and were paired with Leicester City. The tie will be played on Tuesday September 20th, just 5 days before the teams meet in the League on Sunday September 25th.
Sven's team have so far beaten Rotherham and Bury to get to round 3. It's their third away fixture in a row in this competition.
Cardiff have won at Oxford and last week beat Huddersfield at home. Both matches after extra time.
The full draw is:
Cardiff v Leicester
Wolverhampton v Millwall
Chelsea v Fulham
Aldershot/Carlisle v Rochdale
Arsenal v Shrewsbury
Burnley v MK Dons
Leeds v Manchester United
Brighton v Liverpool
Nottingham Forest v Newcastle
Manchester City v Birmingham
Blackburn v Leyton Orient/Bristol Rovers
Swindon/Southampton v Charlton/Preston
Everton v West Brom
Crystal Palace/Wigan v Middlesbrough
Aston Villa v Bolton
Stoke v Tottenham