Highs are forecast around 38 degrees Celsius with significant humidity and peak temperatures are expected an hour or two before the 5pm local-time kick-off in Philadelphia.

Similar heat affected numerous matches at last year’s FIFA Club World Cup tournament, which was also hosted in the United States.

“I was with [France assistant coach] Guy Stephan at the final and semi-final of the [FIFA] Club World Cup,” Deschamps said.

“We were in the stadium. We saw that it was quite hot, and we could discuss [it], and it did have an impact.

“Now, is this good for the players' health as soon as there are extreme conditions, whether it's heat or cold or a hard pitch? It's not ideal.

“But we didn't choose, so we adapt and we anticipate.”

Deschamps also reflected on the most recent meeting between the two sides in a competitive game, when the midfielder played all 120 minutes of a 1-0 win over Paraguay in the Round of 16 on France’s march to the 1998 FIFA World Cup title.

He suggested this latest task could be as tough as that match, decided by Laurent Blanc’s 114th-minute winner.

“It was a very good time for France. It was a very tough game. This is part of the history of football and the World Cup,” he said.

“This match tomorrow is different. It is a different team. It is a Paraguay team that really wants to do it and it has quality.

“[Julio] Enciso, for example, has had a very good season with Strasbourg in France. He is a player with lots of influence in his team. Him and [Miguel] Almiron are players with great technical quality.”

France midfielder Desire Doue insisted Les Bleus won't change their approach nor overlook an Albirroja side many expected to lose to Germany in the previous round.

“We have no pressure,” he said. “We're playing games after games. We are focused on ourselves. There are a lot of qualities.

“We have been the favourites before the competition started. We will be the favourites for tomorrow. But I do not believe that these [odds] will help us win a game.

“It's not that that will help us win. We will need to be perfect from the first to the last minute. We'll have to be there.”

Doue expected the heat to affect performance.

“Well, yes, we are wasting a lot of energy,” he said. “We are sweating more, wasting more water. We might lose some lucidity on the pitch. We arrived in the US. It was hot. Today, it's hotter. And so be it tomorrow.

“Both teams will experience the same conditions, and we are fully ready for this game.”

Paraguay manager Gustavo Alfaro suggested the extreme heat predicted could help his side, but only so much.

Paraguay plays its home qualifiers in the capital of Asuncion, where average summer highs rise to similar heights.

"We are used to the heat. Yes, we are," Alfaro said.

"However, you suffer the heat. What knockout match do you have in Paraguay at five in the afternoon? None. Maybe it happened once and there was a defeat. You don't play at that time."

He also noted it wouldn't be the same as Mexico's advantage playing at high altitude, conditions that Mexico have trained in for weeks.

"Even though you might have this memory, physical memory of understanding what happens with high altitude [or] what happens with heat, it's different from what happens when you're there," he said.

"But the heat will affect both teams. And high altitude affects both teams, yes. But those that have a slight advantage are the ones that were able to prepare in that situation."