And the situation could force Wilder to reduce his squad for next season.
"First of all, I'm not being disrespectful because football was rightly stopped, I'm just speaking from a financial perspective, but it has definitely changed things," said Wilder.
"I'm not embarrassed to say that. We'll lose a chunk of change, I don't know, somewhere between 20 and 30 million I should imagine from the football club's point of view. Perhaps that is a question for (chief executive officer) Steve (Bettis).
"Does that mean it will affect budgets and investment into the team? Yes, that's going to be the case and also what's happening at the football club right now with the transfer of the club from one owner to another.
"I accept that and it's up to me to find another way round that. I will give my best in trying to do what I need to do in order to make the group better for next year, which we have to.
"There's no doubt about it, you can't stand still in this division because it will hurt you - as we've seen in glimpses so far since the return.
"My job next season is to make sure we are stronger than when we first started in the Premier League and there will be some decisions to make."