Extra spice will be added to the game as it is against Reading's arch-rivals and it will be the first time the Royals have played at the Kassan since it's opening in 2001.
Elsewhere, Buckinghamshire outfit Wycome Wanderers are at home to David O'Leary's Aston Villa whilst Swindon Town travel to Leeds.
With United now plying their trade in Division Three and Reading on the verge of the Premiership many had believed that it could be many years before the sides met again in competitive action.
The Royals booked their place in the Second Round courtsey of a 3-1 win at Boston United. You Can Read Our Match Report On That Game Here!
Oxford meanwhile, claimed a massive cup scalp when they defeated Reading's Division One rivals Millwall by a goal to nil at the New Den.