Cristiano Ronaldo believes referees should offer more protection for skillful players at the World Cup, after Portugal's opening 0 0 draw with Ivory Coast.

Portugal, third in the FIFA rankings but who only made it to South Africa after a playoff victory over Bosnia, come closest to scoring when Cristiano Ronaldo struck a post, but there was little to suggest an upsurge from their patchy form during qualifying.

It was a match that desperately needed an early goal to force one team to abandon the tactical approach that has been a feature of the opening round of fixtures.

The Real Madrid player told the BBC he was not happy when he was shown a yellow card in the first half of the game against Ivory Coast.