The Brazilian football icon is expected to be moved in the coming days after undergoing treatment at the Albert Einstein Hospital in Sao Paulo.
The 80-year-old's daughter Kely Nascimento took to social media to reveal that her father was "doing well" and "is not in pain".
She wrote on Instagram: "I wanted to say thank you thank you thank you from the bottom of my heart for all of the loving, concerned and supportive texts, DMs and emails you guys have sent me. I have not had the chance to respond to many but I do read them and I feel hugged.
"He is doing well post surgery, he is not in pain and is in a good mood (annoyed that he can only eat jello but will persevere.
He will move into a regular room in the next day or two and then go home.
"He is strong and stubborn and with the support and care of the brilliant team at Einstein and all of the love, energy and light that the world is sending, he will get through this!"
Pele, the only player to win the FIFA World Cup three times, has been having treatment at the hospital over the past two weeks after the tumour was detected during tests.
The footballer's health has been a concern in recent years and his son Edinho revealed last year that he was "embarrassed" to leave the house as he can no longer walk unaided.