Bradford's joint chairman Mark Lawn has told fans the size of manager Phil Parkinson's playing budget is in their hands.
The Bantams have so far sold 3,000 season tickets for the 2012/13 campaign and Lawn and fellow joint chairman Julian Rhodes have issued a plea to help set up a promotion challenge.
Lawn said: "For those people who want to see a competitive squad out on the pitch next season, Phil needs an appropriate budget.
"To be able to do this, as I've said it in the past and will stress again, season-ticket sales are critical in order to increase Phil's budget to strengthen the squad.
"In essence the playing budget is in the fans' hands. Julian Rhodes and myself both have confidence in Phil to put together a squad that's fit to win the league or at least get a play-off position."
Rhodes added: "Some fans may see this as a rallying cry and you're right, it is. We want to see the same passion and pride from the players when they pull on a Bradford City shirt as our fans show when they're singing from the stands, but unfortunately in the world of football these players come with a price tag."