Millwall will be at home to Cambridge United in the Carabao Cup Second Round.
The two clubs will meet for a place in Round Three after being pulled out together in Wednesday night's draw.
It will be a first meeting between the two sides since an FA Cup Third Round replay victory for Millwall in January 2003, in which Steve Claridge (pen), Paul Robinson and Paul Ifill scored in a 3-2 win.
Second Round ties will be played in the week commencing Monday 23rd August.
Full details, such as a confirmed date, kick-off time and ticketing arrangements, will be announced in due course.