Chelsea have been warned of dangerous playing conditions ahead of their final Club World Cup group game against ES Tunis on Tuesday night. With temperatures in Philadelphia set to soar to 39°C, the city has declared a 'Heat Health Emergency', activating cooling centres, home visits, and even a dedicated Heatline. The match will take place at Lincoln Financial Field — an open-air stadium, unlike their previous fixture in Atlanta’s climate-controlled Mercedes-Benz Stadium.