Fury has asked for an 80% share of the money that the fight would generate, which was turned down by Haye, but the unbeaten fighter has claimed that the bout could still happen.
The 24-year-old told Sky Sports News: "Me and my team are optimistic about the fight, I hear Haye's team are optimistic. So I don't see why this fight should not happen. He wants to fight, I want to fight, so it should be done soon enough.
"I did say that [I wanted 80% of the money] because Haye is a has-been and I am what is in fashion at the moment. What's in fashion needs the lion's share.
"We have a deadline of the end of the month to sign a contract, so if he wants a fight he will sign the contract. If not, we will move on, but is it never over until it is over and there is room for negotiation and I am sure we can reach an agreement."
Fury is unbeaten in 21 fights, while Haye is a former two-weight world champion, winning 26 of 28 encounters.