A combination picture shows boys playing street football (top), and details of a pair of shoes, a pitch and a ball on Windmill Walk, Southwark, central London, Britain, May 25, 2018.

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a football, on an astro-turf pitch in south-east London, Britain, May 21, 2018.

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a football, in the village of Yelizarovo in Yaroslavl Region, Russia, May 15, 2018.

A combination picture shows children playing soccer prior to the inauguration of a new sports complex (top), and details of a football, a pitch and shoes, at La Campanera Neighborhood in Soyapango, El Salvador on May 22, 2018. La Campanera is a community marked by gang violence.

A combination picture shows boys playing soccer (top), and details of feet, a pitch and a ball, in an open field along a road at Iyana-Oworo district in Lagos, Nigeria, May 27, 2018.

A combination picture shows men playing soccer (top), and details of shoes, a football and a pitch, in Santiago, Chile, May 19 - May 20, 2018.

A combination picture shows men playing soccer on a roof stadium (top), and details of a football, a pitch and shoes, in Shanghai, China, May 8, 2018.

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a football, in Alcorcon, near Madrid, May 25, 2018.

A combination picture shows local residents playing soccer (top), and details of shoes, a pitch and a football, on the top floor of a parking garage in Jakarta, Indonesia, May 4, 2018.

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a ball, on a brick court in front of a temple in Hoang Xa village, outside Hanoi, Vietnam, May 19, 2018.

A combination picture shows boys playing soccer (top), and details of a football, a pitch and shoes, at a makeshift pitch in Soweto, South Africa, May 14, 2018.

A combination picture shows children playing soccer on a floating pitch (top), and details of a pitch, flip-flops and a football, in the fishing village of Ko Panyi in southern Phang Nga Province, Thailand, May 19 - May 21, 2018.

A combination picture shows children playing soccer (top), and details of a pitch, shoes and a football, in the village of Ptychie in Stavropol region, Russia, May 19, 2017. Reuters/Eduard Korniyenko

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a football, at Koh Dach resort along the Mekong river banks on the outskirts of Phnom Penh, Cambodia, May 15 - May 22, 2018.

combination picture shows men playing Subuteo (top), and details of Sabuteo pitch, a player and a football, in Rome, Italy, May 13, 2018.

A combination picture shows ski club teachers playing soccer in the snow wearing ski boots (top), and details of ski boots, snow and a football, in Sestriere, Italy, May 14, 2018.

A combination picture shows Eriskay and Barra playing a soccer match (top), and details of a pitch, a Barra player and a football, on the Isle of Eriskay, Scotland, May 5, 2018.

A combination picture shows children playing soccer (top), and details of flip-flops, a football and a pitch by the Botataung Pagoda in Yangon, Myanmar, May 18 - May 23, 2018.

A combination picture shows young men playing soccer (top), and details of shoes, a pitch and a football, in front of the Giant Ferris Wheel in Vienna, Austria, May 17 - May 26, 2018.

A combination picture shows students checking soccer robots (top), and details of a pitch, a ball-handling device, and a ball at the Robot Vision Laboratory of the Tokyo Polytechnic University in Atsugi, Japan, May 14, 2018.

A combination picture shows children playing soccer (top), and details of a pitch, shoes and a ball, on a street in downtown Havana, Cuba, May 24 - May 28, 2018.

A combination picture shows boys playing soccer on a soaked pitch (top), and details of a pitch, shoes and a ball, near Mathare valley slums of Nairobi, Kenya, May 1 - May 19, 2018.

A combination picture shows children playing soccer (top), and details of shoes, a pitch and a football, on an asphalt pitch in Payatas, Quezon City, Metro Manila, Philippines, May 9 - May 24, 2018.

A combination picture shows people playing soccer (top), and details of a pitch, shoes and a ball, at a playground in Moscow, Russia, May 27, 2018.

A combination picture shows local children playing soccer (top), and details of shoes, a pitch and a football, in the Royal Old Town Vranduk built in the 14th century in Vranduk, Bosnia and Herzegovina, May 17 - May 21, 2018.

A combination picture shows boys playing soccer on a net-covered pitch which protects the ball from going out of the ground (top), and details of shoes, a pitch and a football, in Mumbai, India, May 9, 2018.

A combination picture shows boys playing soccer (top), and details of a football, a pitch and sandals, in the old city of Algiers Al Casbah, Algeria, May 5 - May 9, 2018.

A combination picture shows boys playing soccer (top), and details of shoes, a pitch and a football, at the compound of the Dambai EP Primary School after school hours in the town of Dambai, Ghana, May 14, 2018.

A combination picture shows young men playing soccer (top), and details of sandals, a pitch and a football, on a makeshift pitch in Port-au-Prince, Haiti, May 12, 2018.

A combination picture shows boys playing soccer in their garden (top), and details of shoes, a pitch and a football, in Vienna, Austria, May 11 - May 26, 2018.

A combination picture shows men playing soccer (top), and details of feet, a pitch and a ball, outside the village of Pogi in Leningrad region, Russia, May 19, 2018.

A combination picture shows boys playing soccer (top), and details of feet, a pitch and a football, in a residential area in Kolkata, India, May 12 - May 14, 2018.

A combination picture shows local kids playing soccer (top), and details of shoes, a pitch and a football, in Kathmandu, Nepal, May 15 2018.