"I don't think there is a lack of aspiration to spend money," manager Warne told BBC Sport.
"But there is a lack of energy to go down the same route that it has gone before, because obviously the club was in trouble.
"With the players we have signed, they haven't been on contracts of the previous regime and we are trying to make a club that is going to be successful - but sustainably successful. And that's maybe not as sexy as it has been in the past.
"I do think there is money to spend, but not of the eye-watering transfer money that happened in the previous regime..."