PSG manager Luis Enrique said “it is not good for the show” before their 4-0 semi-final win over Real Madrid on Wednesday.
Chelsea defender Levi Colwill added: “Some places have been really hot, the last round was hot and I was stuck watching it and I was thinking: ‘wow, this is so tough.’ I felt bad for them but they managed it really well.”
Earlier this month, players’ union Fifpro said it believed that Chelsea’s game v ES Tunis in Philadelphia should have been delayed or postponed because of the heat.
On Thursday, former Germany striker Jurgen Klinsmann, now on Fifa’s technical study group, recalled punishing conditions in Dallas during the 1994 World Cup in the United States, but said teams must adapt.
“The heat is difficult. If you play in 90 degree [Fahrenheit; 32C] heat then you are going to suffer,” Klinsmann said. “I played in Dallas at 120 degrees [49C] and I was dying!
“We were leading 3-0 at half time, then South Korea came back and made it 3-2 and if we had been on the pitch for another five minutes it would have been 3-3.
“But do I go to Qatar like Germany and complain, complain and bring karma – and then go home early? The teams here now and the teams here next summer who get the draw here in July and July next summer will have to adapt.
“But there will be two teams in the game. It’s not always nice, especially for European teams but they will have to adapt.”
In a statement on the heat last week, Fifa said: “Heat conditions are a serious topic that affect football globally.
“At the Club World Cup some significant and progressive measures are being taken to protect the players from the heat. For instance, cooling breaks were implemented in 31 out of 54 matches so far.
“Discussions on how to deal with heat conditions need to take place collectively and Fifa stands ready to facilitate this dialogue, including through the task force on player welfare, and to receive constructive input from all stakeholders on how to further enhance heat management.
“In all of this, the protection of players must be at the centre.”