Around 2000 have been sold to Bluebirds supporters with the away end sectioned to allow home supporters behind the goal as well.
Reading are running away with the division and already have 65 points and a 20 point gap over 3rd place (before Saturdays games). The step up to the top flight looks to be a formality.
City have sold out of Arsenal tickets as well for next Saturday's FA Cup tie at Highbury.