Cardiff City have been told to pay a transfer fee of 6m euros (£5.3m) to Nantes for Emiliano Sala, reports BBC Sport.
A Fifa panel met to rule on a dispute between the clubs, who had failed to reach agreement on settling payment for the striker.
The Argentine, who was 28, died in a plane crash in January while travelling from France to join his new club.
Cardiff had argued they were not liable for the £15m fee because Sala was not officially their player when he died.
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