The Royals have slashed ticket prices for the cup clash in a bid to draw a bumper crowd to the Madejski Stadium.
And if the Royals overcome Watford they could be paired with the likes of Manchester United, Arsenal and Chelsea in the next round.
The game will be played on Tuesday 21st September, kick off 8pm. But the club are yet to confirm when tickets for the league cup encounter will go on sale.
However tickets will cost £10 for adults and £5 for under 21s and over 65s if booked in advance. If you leave it until matchday to purchase your seats you will be charged £14 for an adults ticket and £8 got under 21s and over 65s.
The club have also confirmed that they will be awarding member card holders ten loyalty points for attending this game - double the number supporters are awarded for attending a home league game.
Reading booked their place in round two of the Carling Cup with a 2-0 win over local rivals Oxford United.
Meanwhile, fans can get a free ticket for the Leeds United game if they purchase tickets for the upcoming Preston, Gillingham and Burnley home games. However, all the tickets must be bought at the same time and the offer is not available if you purchase online.