England are planning hot weather camps in Italy next summer to prepare for the conditions expected at the 2019 World Cup, knowing that some players will toil in the heat.
Head coach Eddie Jones will take his squad to Treviso for two eight- to 10-day spells in July and August ahead of their tournament opener against Tonga on September 22.
England turned their indoor training centre at their Bagshot base into a sweat box designed to mirror the humidity and temperature of Japan in the build-up to their June tour to South Africa.
It was during that experiment that certain players were exposed while others – such as Owen Farrell and George Ford – showed no adverse effects.
“The common-sense approach is that if you’re playing in warm weather, get used to it physically, mentally and skill wise,” said Jones.
“Treviso’s climatic conditions are very similar to the possible conditions we could encounter in Japan and climatic synergy is good.
“I don’t see Treviso as identical, but it’s useful in being able to trial things before the World Cup. We’re trying to dress rehearse it.
“Some players definitely perform better than others. We’ve already heat tested the players once and there were a number of them who have a negative reaction.
“You do all their blood and saliva testing to find out how they’re coping. We have to do more work in getting them right to cope with heat.
“The usual players did well such as Farrell and Ford. The good players always find a way to react.
“Others struggle to retain their work rate and then struggle to retain intensity in terms of skill execution. They’re the two factors.”
Asia’s first World Cup will be staged during a period of the year when Japan is subject to catastrophic weather events, resulting in extensive contingency planning by tournament organisers and competing teams.
“You could have three days where you can’t train outside so we’re definitely coming up with plans to train inside,” said Jones.
“But if there’s a typhoon on you can’t use the roads so you can’t leave your hotel.”
Meanwhile, Jones has welcomed Manu Tuilagi’s blockbusting club form as the Leicester centre closes in on making his long-awaited Test return.
All 36 members of England’s squad for the Quilter Internationals have been cleared to begin training at their pre-autumn camp on the Algarve today, encouraging Jones following a savage run of injuries, suspension and retirement.
Tuilagi was named man of the match against the Scarlets last weekend as his comeback from a series of injuries that have confined him to making one international appearance in four years gathered momentum.
“Manu is getting back to his best – he’s definitely moving in the right direction,” Jones said.
“The good thing is he is doing the basics brilliantly and that is really important going forward.
“We want him to do the basics brilliantly and if he can keep doing that then we are going to be in a good position.”