The Nigeria Football Federation (NFF) broke the sad news on its Twitter page on Monday.
The federation said the 26-year-old former Golden Eaglets shot stopper at the 2009 U17 FIFA World Cup died in Saly, Senegal on Sunday, while on holiday.
It also expressed condolences to the bereaved family of the late footballer.
“Former National U17 and U20 goal keeper John Felagha has died. Felagha died on Sunday in Senegal. Felagha was aged 26. Our thoughts and prayers are with his family,” the NFF wrote.
Felagha represented the nation at the 2013 Africa Youth Championship (AYC) and U20 FIFA World Cup two years later.
Felagha is survived by sisters and uncles.