Physiologist Mike Tipton told Reuters on Thursday that players are at risk of heat stroke.

Temperatures are expected to top 30 °C (86 Fahrenheit) in Doha, 


Wells rescheduled his training sessions for Thursday, moving from afternoon to evening when the weather turned cooler.


Qatar is unusually hot and humid for this time of year, but as of November, the weather is expected to cool off. 


Tipton said that to deal with the heat, managers may be forced to change their teams' playing styles, opting for a much slower pace of play.


“They (the effects) range from feeling faint due to being unable to exercise to a heat stroke, which is a serious medical condition,” Tipton said. 


"It's better to play football in 20 degree wind than 30 degree wind. There's no doubt about it," Tipton said.


"We were sweating just walking around the hotel," Wales forward Mark Harris told reporters. "We went out for a walk this morning at about 11 and it was very warm." 


"There's another factor, which is that when people overheat, they make poorer decisions... They may decide to exercise even harder, which can exacerbate their problems with the heat. " 


However, the players can get some respite on match days as all eight host stadiums have air conditioning.


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