Muamba collapsed after suffering cardiac arrest during an FA Cup tie at Tottenham in March.
His future in the game remains in doubt, but the Bolton midfielder says he has taken to the field again.
He told CNN World Sport: "I was on holiday and I was staying in a hotel and there were quite a few footballers in the hotel as well.
"The staff of the hotel usually play against the visitors so I was by the pool and I heard they were playing football. I was like 'ah really?' and I was like 'yeah' and there's me thinking maybe I should try.
"Then I went across and saw other footballers playing and I told my friends and (fiance) Shona. I told her 'I am sorry but I am going to play football'. She goes 'are you sure?' and I say 'yes' and I just went in there."
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The 24-year-old admitted his fiance was "scared" as he played for around 25 minutes. However, he had no problems and was just glad to be back in action.
Muamba added: "It was just to get back into the groove and to get back into momentum.
"It was just playing like I was training. It was great, I enjoyed it.
"I just hope to God that I can get in there myself, with the 11 players on the pitch and to play would be fantastic."