Coyle is happy to continue signing young players with potential, rather than readymade stars.
"Any money we've had we've invested in younger players, who we'd hope would grow with us and become better players," he said.
"If we'd have tried to bring in established Premier League players, we wouldn't have been able to afford their fee or their salary. But that suits me.
"I want to bring in young players who I can mould and make better, Steven Fletcher being an example, who can serve this club for years to come.
"We've had to put a business plan in place to secure our future. We couldn't go out and spend £20m and lose our place in the league, because then we'd be on a downward spiral, which has happened to some other clubs, who are now in the third tier of English football.
"So, we have done our best to attract younger players, who will give us consistency and longevity, to protect the club."