Watford will face Reading in the Carabao Cup second round at the Madejski Stadium.
The fixture is set to be played on Tuesday, August 28 and a time is yet to be confirmed.
The draw was unseeded but regionalised into north and south sections.
In their last two meetings, The Hornets won both games 1-0 and 4-1 respectively during the 2014/15 season in the Championship.
Ticket information will follow on the club’s website in due course.