"It is important that the two clubs reach an agreement so I can go."
The Cameroon international added: "This is an opportunity that comes round only once. Everton are proposing £1.1 million-a-year, while at Rennes I do not receive even half of that. Even if I do everything for this club, I have a family to feed, without counting the challenge, which is very interesting.
"It is an ideal springboard for my career."