The 23 year old from the Isle of Wight played 52 times for Brentford last season.
Funnily enough City face Brentford in a friendly next Tuesday at Griffin Park.
Moore was tipped as a potential England international by David James earlier this year.
With the imminent arrival of John Brayford as well we might see a couple of new faces confirmed on Friday.
Moore in action:
Source: Cardiff City Online