Kathy, who wanted to be known only by her first name, said Toffee's owner was devastated that the person she left him with had not taken care of him as had been promised.
"We will be working towards him getting his full health back and being given full vet clearance before he can travel.
"We have no idea how we will pay for it but I am hoping that some of the people who have followed his story will be able to help to get him home."
The search for Toffee went viral on social media after a post to find the cat's owner was uploaded late last week. He had been microchipped in Tauranga.
The New Zealand Lost Pet Register put the post up on Friday night and it had been viewed 286,771 times.