The Bolton star, 23, collapsed at Tottenham's White Hart Lane stadium in London and was taken to the London Chest Hospital in a critical condition.
But his health is improving - a statement from his soccer club reads: "Fabrice Muamba remains in intensive care at The London Chest Hospital, where today (Monday) he is showing small signs of improvement.
"His heart is now beating without the help of medication and he is also moving his arms and his legs. However, his long-term prognosis will remain unclear for some time. He is still critically ill and will continue to be closely monitored and treated by staff in The London Chest Hospital's intensive care unit."
Muamba escaped the Democratic Republic of Congo, where he grew up, when he was 11 and moved to England with his family. He represented England at under-21 level.
After paramedics failed to revive Muamba on the pitch, match referee Howard Webb abandoned the game.
Bolton's English Premier League game with Aston Villa, scheduled for Tuesday (20Apr12), has also been called off.