Teenage Barcelona star Lamine Yamal and fellow winger Nico Williams will be available for Spain's World Cup opener against debutants Cape Verde on June 15, coach Luis de la Fuente said on Sunday.

Yamal and Athletic Bilbao's Williams both missed the end of the club season with hamstring injuries and their imminent returns will be a big boost to the European champions.

Osasuna winger Victor Munoz is also expected to be fit for Spain's opening game in Atlanta, although none travelled to Mexico for Monday's friendly with Peru and instead remained at their training camp in the United States.

"We regret that they are not here with us, but the medical and physical conditioning staff advised them to stay there," De la Fuente said.

"All three should be available for the next match... they are progressing well in their recovery and are doing very well."

Spain will be one of the favourites at the World Cup in Canada, Mexico and the United States, and the 18-year-old Yamal could be one of the star performers.

After facing Cape Verde, Spain will play Saudi Arabia in Atlanta before finishing their group stage campaign against Uruguay in Guadalajara.

World Cup star 'really sorry' after missing daughter's birth

South Korea goalkeeper Kim Seung-gyu has some making up to do after missing the birth of his first child because he is preparing for his fourth World Cup.

The 35-year-old stopper is hoping to add to his 86 caps when South Korea face the Czech Republic on Thursday's opening day of the tournament in North America.

But it has come at a personal price, missing the birth of his daughter.

"I am really sorry that I couldn't be with my wife for the birth," the veteran told reporters in Mexico, where the Koreans play in the group stage.

"I want to bring home good results from here as my presents."

Kim, who plays in Japan for FC Tokyo, is likely to get the nod ahead of Jo Hyeon-woo as coach Hong Myung-bo's first choice in goal, Yonhap News Agency said.

"I've played at every World Cup thinking it could be my last," Yonhap quoted Kim as saying.

"Given my age now, this one really does feel like my final one."

South Korea also play South Africa and co-hosts Mexico in Group A.