Cheltenham Town will play Millwall away from home in the Carabao Cup second round.
The Robins reached the second round after an impressive 1-0 away victory over League One Peterborough United on Saturday.
The reward for winning at the Posh is a trip to Championship side Millwall with the game taking place at The Den.
Round two matches will take place the week commencing 14 September and will be in midweek.
The winners of the second round tie will be at home against either Burnley or Sheffield United.