The City of Cardiff would be ready to sue Agent Willie McKay after admitting to having inflated Emiliano Sala's transfer fee.
Sala's body was found on board the missing private jet that was transporting him from Nantes to Cardiff.
The attacker had returned to his former club to say goodbye to his teammates just days after making a £ 15m transfer to South Wales.
Cardiff has not yet made the initial payment to Nantes as they seek to gather all the facts behind the deal.
It was reported this weekend that they had been in touch with Premier League clubs for help with the payment of £ 15 million.
Willie McKay admitted in emails leaked to Sala that he had inflated his price by confirming his interest elsewhere.
Everton, West Ham, Crystal Palace, Burnley, Wolves and Fulham would all be interested.
The Mail claims that at least one of these clubs said that there was no interest and that they had never even watched Sala.
Cardiff leaders would consider McKay's admission as a "price manipulation" and their owner, Vincent Tan, could sue the agent.
The Bluebirds could claim that McKay represented Nantes in the contract and therefore indicate that the French club was somehow responsible for the flight.
However, while Cardiff claims that McKay has no relationship with the club, he is known to be well known to his boss, Neil Warnock.