Marca claims that Ronaldo could follow in the footsteps of Ruud van Nistelrooy by requesting a transfer.

Billing it as an 'unwritten law of English football', the paper claims that a formal transfer request is used to indicate displeasure and a desire to move on.

The transfer list, which apparently is not replicated in Spain, is produced by clubs, but players can request in writing their desire to join it. Marca, of course, claims that Ronaldo "might" submit a letter of his own.

This would be done if he had the desire for a change of scenery after the European Championships - with, say, Real Madrid interested in his signature.

Marca further claims that Ruud van Nistelrooy took this step due to his "differences" with Alex Ferguson.