Porto has presented Real Madrid with a written offer for Iker Casillas.

Coached by former Real Madrid and Spain goalkeeper Julen Lopetegui, Porto are keen to acquire the 34-year-old and are 99 percent certain that the Estadio do Dragao will be his next destination, according to a report from TVE.

In order for a deal for Casillas to be completed, TVE says Real would have to contribute to the payment of his wages, although AS reports that no deal will go ahead unless the salary is paid in full by the buying club.