Dr Andrew Deaner described Muamba's recovery as "miraculous" after he was effectively brought back from the dead after the player's heart had stopped for over an hour.
"If you're going to use the term miraculous, I guess it could be used here," said Dr Deaner.
Muamba, 23, remains in intensive care at the London Chest Hospital where he had been in a critical state since Saturday evening. However, early signs of a recovery continue and the footballer on Monday night told Bolton's team doctor Jonathan Tobin he was "fine".
Dr Jonathan Tobin, who visited Muamba on Monday evening, said: "I'm glad to say that the early signs of recovery have continued. I went to see Fabrice last night. I went in and he said 'Hi, doc.'
"I asked him how he was and he said 'Fine'