Everton said in their email to supporters: "As part of our ticketing checks ahead of this game, we have investigated whether there are potential away supporters who have purchased home tickets.
“To do this, we have looked at accounts without any kind of previous purchase history with Everton Football Club and a non-local home address.
"With this information, we have identified that your account has fallen into a category which suggests that you are an away supporter. As a result of this, your tickets) have been cancelled and all monies have been refunded back to your payment card.”