East Bengal won the last edition of the prestigious tournament when they defeated Goan giants Dempo Sports Club 3-2 in the title clash last October.
"We are yet to get the prize money for winning the tournament though it's been many months now," a club official told PTI on condition of anonymity.
In this regard, the club has approached the federation many times, but to no avail.
The winners' prize money is Rs 25 lakh.
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The eight-time Federation Cup winners' triumph in the title clash turned out to be a perfect gift for their successful coach Trevor Morgan who turned 56 on the same day.
That was also East Bengal's second Federation Cup triumph in Morgan's third season.
East Bengal recently appointed Brazilian Marcos Falopa, who has been a FIFA instructor since 1996, as coach for the upcoming season.
East Bengal will play against Semen Padang of Indonesia in their home and away quarterfinal matches of the AFC Cup football tournament in September.
East Bengal have reached the last eight for only the second time in seven tournament appearances.