The Millers are one of 15 unseeded Northern teams as once again the draw is regionalised, and they will face one of the seeded fellow Northern sides in round one.
The same rules apply to the Southern sections, where there are split seeds of 20 teams.
Burnley and Hull City have been given byes to round two.
Details as follows:
North - Seeded
1.Nottingham Forest
2.Leicester City
3.Sheffield United
4.Middlesbrough
5.Doncaster Rovers
6.Derby County
7.Preston North End
8.Barnsley
9.Coventry City
10.Scunthorpe United
11.Leeds United
12.Sheffield Wednesday
13.Peterborough United
14.Huddersfield Town
15.Walsall
North - Unseeded
1.Carlisle United
2.Oldham Athletic
3.Tranmere Rovers
4.Hartlepool United
5.Rochdale
6.Stockport County
7.Morecambe
8.Rotherham United
9.Chesterfield
10.Bury
11.Bradford City
12.Accrington Stanley
13.Crewe Alexandra
14.Macclesfield Town
15.Lincoln City
South - Seeded
1.Portsmouth
2.Cardiff City
3.Swansea City
4.Reading
5.Bristol City
6.Queens Park Rangers
7.Ipswich Town
8.Watford
9.Crystal Palace
10.Norwich City
11.Millwall
12.Plymouth Argyle
13.Charlton Athletic
14.Swindon Town
15.Southampton
16.Colchester United
17.Brentford
18.Bristol Rovers
19.Milton Keynes Dons
20.Brighton & Hove Albion
South - Unseeded
1.Yeovil Town
2.Leyton Orient
3.Exeter City
4.Notts County
5.AFC Bournemouth
6.Dagenham & Redbridge
7.Gillingham
8.Wycombe Wanderers
9.Southend United
10.Aldershot Town
11.Port Vale
12.Northampton Town
13.Shrewsbury Town
14.Burton Albion
15.Hereford United
16.Torquay United
17.Barnet
18.Cheltenham Town
19.Stevenage
20.Oxford United