Pompey will learn their Carabao Cup first round opponents when the draw takes place on Friday morning.
Kenny Jackett’s side are in the southern section, although – unlike previous seasons – there is no seeding.
The draw will take place in Ho Chi Minh City, Vietnam at 10.45am UK time and feature 70 EFL clubs.
Pompey are ball number 26 and could face any other side in the southern section.
Matches are scheduled to be played in the week commencing August 13 and will no longer feature extra-time, with drawn matches going straight to penalties.
West Brom are included in the draw, although fellow Championship newcomers Stoke and Swansea enter in round two, along with those Premier League sides not competing in Europe.
Manchester City are the current holders of the Carabao Cup after beating Arsenal at Wembley in February’s final.
|1||AFC Wimbledon||Accrington Stanley|
|3||Birmingham City||Blackburn Rovers|
|5||Bristol City||Bolton Wanderers|
|6||Bristol Rovers||Bradford City|
|7||Cambridge United||Burton Albion|
|9||Cheltenham Town||Carlisle United|
|10||Colchester United||Crewe Alexandra|
|11||Coventry City||Derby County|
|12||Crawley Town||Doncaster Rovers|
|13||Exeter City||Fleetwood Town|
|14||Forest Green Rovers||Grimsby Town|
|16||Ipswich Town||Leeds United|
|17||Luton Town||Lincoln City|
|19||Milton Keynes Dons||Mansfield Town|
|22||Norwich City||Nottingham Forest|
|23||Oxford United||Notts County|
|24||Peterborough United||Oldham Athletic|
|25||Plymouth Argyle||Port Vale|
|26||POMPEY||Preston North End|
|27||Queens Park Rangers||Rochdale|
|29||Southend United||Scunthorpe United|
|31||Swindon Town||Sheffield Wednesday|
|32||West Bromwich Albion||Shrewsbury Town|
|34||Yeovil Town||Tranmere Rovers|