As the countdown to the 2026 FIFA World Cup intensifies, a coalition of 21 leading doctors and professors from across the globe has issued a stark warning to football's governing body: extreme heat could pose a serious threat to player safety this summer.

In a three-page open letter published Wednesday, the medical and climate experts—representing fields from public health to sports performance—urge FIFA to take immediate action. "We write in our professional capacity as medical, public health, performance and climate science practitioners and researchers," the letter states, "concerned about and in some cases responsible for the health, safety, and wellbeing of elite footballers competing at the highest level of the men's game, due to the worrying levels of heat stress they could be exposed to at the 2026 men's World Cup."

This isn't the first time North America's sweltering summer climate has raised red flags. During last year's expanded Club World Cup, players were spotted standing in front of field-level sprinklers to cool down, while substitutes were directed to sit inside air-conditioned locker rooms rather than on the bench. These ad-hoc measures highlight a recurring issue that now threatens to overshadow the world's biggest tournament.

The 2026 World Cup, running from June 11 to July 19 across the United States, Mexico, and Canada, will feature 16 venues—but only three boast air conditioning. Alarmingly, the championship final is scheduled for MetLife Stadium in New Jersey, an open-air venue with no roof at all.

The letter takes particular aim at FIFA's own research record, citing the organization's "database of health-related guidelines" and claiming it "only conducted, or made public, minimal research studies into the impact of heat stress on players." The experts argue this contradicts a statement FIFA made in July 2025, when the organization appeared to acknowledge the risks.

With kickoff just months away, this last-ditch appeal underscores a growing concern: as the beautiful game expands to new climates, protecting the players who make it possible must remain the top priority. For fans and athletes alike, the message is clear—heat isn't just an inconvenience; it's a game-changing factor that demands serious attention.