A senior FIFA official has said player welfare is his main priority ahead of plans to hold the World Cup in Qatar in 2022.
FIFA vice president Jeffrey Webb said in a BBC radio interview on Sunday that any decision on whether to host the tournament in summer or winter must be "what's best for football".
Summers in Qatar can reach 50C and there is an ongoing debate as to whether it should be moved to winter.
"The real concern from my perspective will definitely be the conditions for the players," said Webb.
"The World Cup is about the players and it's about showing them the necessary respect," he said.
"If we have to move it to the winter or are able to stay in the summer, let's do what's best for football."
His comments come after a university report suggested the 2022 Premier League season would have to be cut short to help England acclimatise.
Earlier this month, Football Association chairman Greg Dyke said holding a summer World Cup in Qatar in 2022 would be "impossible".
Qatar's World Cup organising committee says it is ready to host the tournament in summer or the winter.