The Bolton midfielder began breathing independently again and speaking two days after collapsing during Saturday's FA Cup quarter-final at Tottenham, and medics said on Tuesday he had a "comfortable night" in intensive care.
"It's still very early in the process," Bolton manager Owen Coyle said after speaking to Muamba in hospital. "There is still a long way to go but there are encouraging signs ... and we pray he continues to improve."
Coyle hopes the 23-year-old Muamba, who fled to England from Congo's civil war in 1999, will one day return to action.
"It is something which has happened before," Coyle said. "There are two things which might help - he is such a fit young man and in the life that he has had he has needed to fight every step of the way."
Premier League chief executive Richard Scudamore said that "everyone comes out of this with huge credit", particularly the medics at Tottenham who immediately raced onto the pitch to try to resuscitate Muamba.
But there will be a full review of the treatment available at White Hart Lane for the former England Under-21 international and the medical checks that footballers receive.
"Incidents and events shape policy, shape developments, shape progress," Scudamore said. "We will look at every aspect of what happened and ... if there are ways and means of making it better in the future. We will do everything we can to reduce to the point of elimination, if we possibly can, things like that."
An ambulance was on hand on Saturday following criticism from then-Chelsea manager Jose Mourinho in 2006 about the time it took for goalkeeper Peter Cech to be transported to hospital after fracturing his skull during a game at Reading.
Medics are yet to reveal the cause of Muamba's cardiac arrest, but Manchester City manager Roberto Mancini on Tuesday said twice yearly medical screenings should be considered for Premier League players.
But the Professional Footballers' Association disclosed that it has spent around $US10 million ($A9.5 million) over the past 20 years on screening professional footballers for heart defects.
"In the immediate aftermath of Saturday night, we checked Fabrice's records and he had been screened four times," PFA chief executive Gordon Taylor said.
"What they have in Italy is government-funded. In England the PFA does it. The truth is even if you screened someone every three months, there may be some things that wouldn't get picked up."
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