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Real Madrid management are concerned with the prospect of Cristiano Ronaldo's Portugal failing to qualify for next year's World Cup.

Sport says Real president Florentino Perez is banking on Ronaldo's appearance in South Africa to boost shirt sales and rake in the expected revenue that was to come from his arrival this season.

Carlos Godinho, Portugal's sports director, has conceded the federation will lose €100 million if they fail to qualify for the World Cup - and Perez has concerns Real will also suffer in the fallout.

If Portugal fail - and Real disappoint in their title chase - then Perez knows that the media and fans will drop Ronaldo to focus on other stars, like Barcelona's Lionel Messi and Manchester United's Wayne Rooney.

Real's new Galacticos policy relies heavily on Ronaldo remaining the world's most popular player - and biggest shirt seller.