Spain forward Diego Costa has said that he is ready to fight for the current World Cup holders at this year's tournament.

Brazil-born Costa rejected the chance to play for the host nation in favour of Spain, but he claims that he is not affected by the criticism he has faced for his decision.

"My game is to fight, to fight and to fight for every ball. That is my style," he is quoted as saying by the Daily Star.

"I am a calm player but I do not accept anyone showing me or my teammates a lack of respect. Spain is the world champion and needs to defend this title. We will give everything to make it happen.

"I have confirmed that Spain is my country and the Spanish people are behind me. The criticism of my decision does not affect me. Brazil are serious contenders too but they are under a lot of pressure from their supporters. The people expect them to be in the final and that makes it tough for them."

Spain face the Netherlands in their opening Group B match on Friday.