Fabrice Muamba may be on the road to recovery from a cardiac arrest he suffered in March, after he revealed he had joined in a kickabout with fellow professionals Kieran Richardson and Jordan Henderson.
The trio were holidaying in Dubai in the close season, and Muamba told CNN's Piers Morgan at the Olympic Park he played for 25 minutes and "felt great".
Morgan also tweeted the 24-year-old was "flying to Belgium docs next week to hear if he can play pro football again".
Bolton midfielder Muamba's heart stopped beating independently for 78 minutes after he collapsed in the 41st minute of the Trotters' FA Cup quarter-final match at Tottenham Hotspur on 17 March.
He was discharged from the London Chest Hospital a month later.