Chelsea manager Enzo Maresca says it is “impossible” to organise normal training sessions amid a “code red” severe heat warning in Philadelphia at the Club World Cup.
The Blues players trained at Subaru Park, the home of local Major League soccer side Philadelphia Union, in 37C heat.
The 45 percent humidity means it feels more like 45C, according to accuweather.com and temperatures on Monday were predicted to to reach over 100C Fahrenheit (37.78C) for the first time in 13 years.
“This morning’s session has been very, very, very short,” said Maresca, adding that “otherwise you don’t save energy for the game”.
“It’s been just about tomorrow’s game, planning for tomorrow, and that’s it. No more than that,” the Italian added.
“As you can see, it’s not easy in these conditions with these temperatures. We are going to try to do our best.”
The local public authority has warned people in Philadelphia to avoid “work in high heat environments” and “strenuous physical activity”.
However, some matches at Fifa’s newly expanded tournament have kicked off in the middle of the afternoon, with temperatures at their highest.
“It’s difficult to work with these temperatures but we are here and we trying to do our best and we will try to win tomorrow,” said Maresca.
Similar problems have been faced by other clubs, raising concerns about the United States co-hosting the World Cup at this time next year.
Borussia Dortmund manager Niko Kovac said he was “sweating like I’ve just come out of a sauna” after his side beat Mamelodi Sundowns in 32C heat in Cincinnati on Saturday.
After Atletico Madrid’s 4-0 defeat by Paris St-Germain in 32C in Pasadena, midfielder Marcos Llorente said it was “terribly hot” and added “my toes were sore, my nails were hurting… it’s incredible”.
Chelsea are under pressure for their final Group D match against Tunisia’s ES Tunis after losing 3-1 to Brazilian club Flamengo last time around.
The Blues need to avoid defeat to qualify as runners up, which would secure last-16 tie against Bayern Munich, Benfica or Boca Juniors.
Captain Reece James is a doubt through because he is “ill” and Nicolas Jackson is suspended after his red card last week and was left out of the open training session on Monday.