Sayan on Friday thanked everyone for their messages and support as he was transferred from Srivichai to Praram 9 hospital to continue his treatment.
He said earlier in the day that he would love to meet all his fans - probably for the last time - at one more concert, to raise money to help fight his illness and for his children.
Fans, friends and other singers across generations, including Sornchai Mekwichien and Seree Rungsawang, arrived to offer moral and financial support on Friday at Srivichai Hospital before he was transferred.
Whether he can realise his desire for another concert is uncertain, but his supporters have already agreed to organise one to help him.
Saenrak Muangkorat, Sayan's spokesman, said three concerts were being planned -- in Phra Pradaeng district in Samut Prakan province, his home province of Suphan Buri, and a finale at the National Theatre. The concert could be named "Farewell concert to your old favourite'', he told Thai Rath online.
Sayan's wife, Wannaporn Sumrit, and one of their daughters, Suwaminee Deesamuer, both said every family member and many other people besides were giving him courage to fight the cancer she said was in his body.
"All children are helping him in this fight, and staying side by side with him. We all want him to rest and stay healthy,'' said Mrs Suwaminee, 25. Another daughter, Siprapa, is a year younger.
Sayan, whose real name is Sayan Deesamuer, was admitted to Srivichai on Monday suffering from symptoms of fatigue and having lost about 15 kilogrammes in weight in June.
Doctors at the hospital said on Thursday that they had found a lump in his liver, but could not confirm whether it was cancer. The announcement at a press conference shocked his fans and everybody close to him.
"He was healthy and showed no signs of illness before,'' Cholathee Tharnthong, a songwriter who discovered his talent and later helped guide him to fame, told FM100.5 news programme on Friday.
Another luk thung singer, Yodrak Salakjai, who was Sayan's friend and earned fame in the same period, died of liver cancer in 2008.
Sayan was born into a corn farming family in Doembang Nangbuat district of the central province of Suphan Buri 60 years ago. He grew up with a strong desire to be a luk thung singer.
Mr Cholathee discovered him humming a song by Sornkhiri Sriprachuap when Sayan was working as a car washer at a petrol station in Bukkhalo of Thon Buri.
Mr Cholathee asked him whether he wanted to be a singer and gave him the song "Police Chief's Daughter'', which became a hit and launched him to stardom.
''The first time I heard him sing, I knew this kid had talent,'' the famous songwriter recalled.
Sayan has recorded more than 1,000 songs in his career, about 300 of them written by Mr Cholathee.
Below is a music video of Mr Sayan's "Police Chief's Daughter''.
Below is Budding Lotust/Ripen Lotus - another hit song of the legendary luk thung crooner.