"We know there are other strong teams in Europe, the Americas and in Africa and all can be champions," the 59-year-old former Real Madrid coach said on Friday. "In theory, it's Argentina and Brazil for the Americas, in Europe it's Italy, Germany and England and ourselves, but there are also some African countries who could make life difficult."
France, who only qualified after a controversial play-off victory against Republic of Ireland, are also "a candidate for the title," he added.
Del Bosque's men will play Raymond Domenech's side in a friendly in Paris on Wednesday as they prepare for the finals campaign in June. "We have our own identity, our style of play, and we're not going to change much. But each match has a story. And I don't think that we'll always have the initiative against a strong team such as France," Del Bosque said.
Spain play Chile, Honduras and Switzerland in Group H. They could then face Brazil, Portugal or Côte d'Ivoire in the last-16. Del Bosque took over from Luis Aragones after Spain won the UEFA EURO 2008 title. His side have lost just one game since then, against the United States in the FIFA Confederations Cup last year.