The Director of Chiang Rai Hospital said that the boys will need to remain hospitalised for seven to 10 days and then another month of home recovery.
This prompted an worldwide rescue effort, with volunteers from all over the world lending their resources to retrieve the boys one by one.
Thongchai said the soccer teammates are in a "very good mental state" and are showing no signs of stress.
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"When the time is right, and everyone involved is ready I'd personally like to invite the children and the coach to attend a La Liga match" in Spain, president Javier Tebas said in a statement Wednesday.
The four boys rescued on Sunday are now eating normal food and walking around, while the four extracted on Monday are being given soft food.
At a school opposite the hospital in Chiang Rai where the boys are recovering, schoolchildren were in an excited, celebratory mood.
None of the first group of four boys to emerge has a fever, and the two boys that had lung infections are improving.
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"Everyone is strong in mind and heart", he said Tuesday at a news conference of officials involved in the high-risk rescue effort.
Video of the rescued Thai football team chatting with nurses and making two-finger victory signs has been released by the Thai hospital where the 12 boys and their coach are recuperating. The family members were not allowed to enter the room where they are being treated, in order to avoid infection, Dr Chaiyawej Thanapaisarn said. Some of their parents are seen crying and waving to them from behind glass.
Nopparat Kanthawong, the head coach of the Wild Boars team, told CNN that he did not know why the boys had gone into the cave.
The saga started on June 23 when the players walked into the Tham Luang cave complex after football practice and were trapped when monsoon flooding blocked their exit.
The three Royal Thai Navy SEAL divers and medics who stayed in the cave with the boys and coach since they were located on July 2.
Dutch media rejoiced on Tuesday afternoon as a Thai children's football team and their coach were all safely rescued from a flooded cave complex in Northern Thailand. Lit by several beams of white light, the divers in wet suits and helmets are seen submerging themselves in the water and grabbing on to a metal dive line used to guide them through the winding channels of the six-mile cave.
The rescue process started at 10am local time on Sunday and involved 13 global divers and five Thai navy seals, who were referred to as "an all-star team" by NarongsakOsatanakorn, who is the Governor of Chiang Rai province and head of the joint command centre coordinating the rescue. "I'm happy that the boys are out too", said Khamluh Guntawong, the grandfather of team coach Ekkapol Chantawong.
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3rd Thai cave rescue mission underway
Before resuming the rescue Monday, officials said they hoped to free all the boys by the end of the day, according to ABC News . He said a medic and three SEALS in the cave, who've been looking after those trapped, will also come out.