United won through to the second stage of the competition after a 2-1 win over Chesterfield on Tuesday night, but the draw will not generate much excitement among Iron supporters.
The game is likely to be played at the Liberty Stadium on Tuesday August 25.
Draw in full: West Brom v Rotherham, Norwich v Sunderland, Tranmere v Bolton, QPR v Accrington Stanley, Bristol City v Carlisle, Leyton Orient v Stoke, Port Vale v Sheffield Wednesday, Hull v Southend, Leeds v Watford, Cardiff v Bristol Rovers, Portsmouth v Hereford, Crystal Palace v Manchester City, Wolves v Swindon, Gillingham v Blackburn, Blackpool v Wigan, Southampton v Birmingham, Preston v Leicester, Newcastle v Huddersfield,
West Ham v Millwall, Hartlepool v Burnley, Nottingham Forest v Middlesbrough, Reading v Barnsley, Swansea v Scunthorpe, Doncaster v Tottenham, Peterborough v Ipswich