And for the first time, Hong Kong and mainland fans will have to use separate entrances, Hong Kong Football Association Chief Executive Mark Sutcliffe told BBC News. They will also be segregated - standard practice for football matches in most parts of the world, but a novelty in Hong Kong. "Fans from both sides will be clearly separated, even using different washrooms. There are very few opportunities for them to clash inside the stadium," the association's chairman Brian Leung told journalists. Mongkok Stadium can hold around 6,000 spectators but mainland Chinese fans have been allocated only 500 tickets. Tickets reserved for local fans sold out quickly, with the website of an online ticket seller reportedly crashing under the weight of high demand. But fans are not the only ones making sure to book themselves a seat in the stadium. Local and international media, and a team from Fifa, will be out in force too: watching both sides - and their fans. Last month, football's governing body fined the Hong Kong Football Association 40,000 Hong Kong dollars ($5,160; £3,400), after local fans booed the national anthem "March of the Volunteers" during a qualifier against Qatar in September. Hong Kong, as a semi-autonomous Chinese city, shares the national anthem with mainland China - but increasingly little else. Political tension between Hong Kong and China has surged in the past five years, culminating in last year's pro-democracy "Umbrella Movement". But the booing began only during the current World Cup campaign.