Bradford beat Premier League Wigan and Arsenal before overcoming Aston Villa in Tuesday night's dramatic semi-final second leg to become the first fourth division team to reach a major Wembley final.
The League One Bees get their own shot at a giantkilling when they host the European champions and FA Cup holders in the fourth round on Sunday.
Moore admits he was stunned by the Bantams' success but feels Brentford can follow their lead and rock the Blues at Griffin Park.
"It's unbelievable," he said.
"But that's the beauty of the cup competitions, anyone can beat anyone. There have been a few upsets in the last round of the FA Cup as well so why not?
"Whoever you are playing against you have go to have belief that you can win the game."