
A group of world-renowned scientists have warned FIFA that current heat safety measures for the 2026 men's World Cup are "inadequate" and could put players at serious health risk.
In a letter, international experts on health, climate and sports performance say the governing body's guidelines are not in line with current science and "impossible to justify." They are calling on FIFA to introduce stronger safeguards, including longer breaks and measures to postpone matches in extreme conditions.
Heat is expected to be a problem at this summer's tournament in the United States, Canada and Mexico, with researchers warning that temperatures in 14 of the 16 stadiums being used could exceed dangerous levels.
In parts of the southern United States and northern Mexico, average maximum daytime temperatures are typically in the low to mid-30s and can rise toward 40s during the hottest periods.
When temperature, humidity, wind speed and sunlight intensity are taken into account, players in these World Cup host cities are at the greatest risk of experiencing extreme levels of heat stress on the body.
FIFA says it is "committed to protecting the health and safety of players, referees, fans, volunteers and staff" and that climate-related risks are being assessed as part of tournament planning.
What are the current measures?
As part of its "commitment to player welfare", FIFA has introduced mandatory three-minute rest breaks in each half of every match in the tournament, regardless of weather conditions.
There will be climate-controlled benches for technical staff and substitutes at all outdoor matches.
FIFA also uses the standard measure of heat for sport, the Wet Globe Temperature (WBGT), which assesses the physical stress of heat on the body and combines heat and humidity. A WBGT of around 28°C is widely considered to be the threshold at which heat stress becomes a significant concern for elite athletes.
According to FIFA's external emergency care manual, if the WBGT reading is near, at or above 32°C, match organisers must agree "what precautions should be taken to prevent the occurrence of any heat-related illness".
FIFA said it has also taken measures for fans at matches “when forecasts indicate high temperatures.” Spectators will be allowed to bring a sealed bottle of water into the facility, and match venues will activate additional cooling, including shaded areas, steam systems, cooling buses and expanded water distribution.
What are scientists looking for?
The 20 experts who signed the letter include leading academics from the UK, US, Canada, Australia and Europe.
They want FIFA to urgently review its approach, including:
Postponement of matches above 28C WBGT.
Longer cooling breaks of at least six minutes.
Improved cooling devices for players.
Regular updates to guidelines based on the latest science
They also urge FIFA to adopt standards proposed by global players' union Fifpro.