Muamba collapsed in the 41st minute of Bolton's FA Cup quarter-final against Tottenham, with the match abandoned after the player received treatment on the pitch from paramedics.
He was rushed to hospital and the club have now released a statement which reads: "Bolton Wanderers can confirm that Fabrice Muamba has been admitted to the heart attack centre at London Chest hospital where he is currently in a critically ill condition in intensive care."
It added: "No further information will be issued at this stage. The club has requested the media to respect his family's privacy at this time."
Source: PA
Source: PA