After landing at Heathrow yesterday, Mr Volanthen, in his 40s, said he was relieved to find the boys alive after nine days trapped in the flooded caves.
They are malnourished and weak, and doctors are anxious that they could be susceptible to germs spread by family members or other visitors, Dr. W. Ian Lipkin, a Columbia University infectious diseases expert, says. At the first training session since their teammates went missing in a Thai cave, the remaining "Wild Boars" said they can not wait to see their friends back on the pitch.
He wrote: "I promise I will care for the kids as best as possible".
People magazine was granted a sneak peak of ABC News' 20/20 special edition where they discovered one of the boys' mates was holding a vigil by keeping his trapped friend's school seat warm.
Well, a former Thai Navy SEAL diver recently revealed how the team successfully carried out the smooth rescue mission.
A Thai government official says all 12 boys and their coach are doing well after their rescue from the Tham Luang cave.
"Suddenly the Australian guy who was overseeing that area started shouting that the water pump had stopped working", Chaiyananta told AFP.
He dropped off the device in person, just days later, after the first few boys had already been freed from the cave.
During the rescue, some Thais said on social media that the soccer team had been reckless in entering the cave during the rainy season.
"I want to tell the boys, please don't blame yourselves", she said.
The head of the diving team, meanwhile, urged the boys on Thursday to "be a force for good".
Several boys can be seen in facemasks and hospital gowns, at least one giving a victory sign for the camera.
Ewan McGregor, a British missionary in the city of Chiang Rai where the boys are now in hospital, said: "It really is a miracle and a result of prayer and I'm just excited to hear the testimonies of the boys when they're safe and well".
Musk and a team of engineers from three of his companies even flew to Thailand to make their idea come to life.
"This reaction has shaken my opinion of many people", he said.
The doctor has been hailed a "hero of the Thai people" and an "extraordinary Australian" for his pivotal role in the risky rescue mission.
"Hooyah!" Rear Adm Apakorn shouted before boarding his flight, using a morale-building navy term. They forged deeper into the cave and found a dry, elevated slope where they remained stranded in total darkness for 10 days before rescuers located them.