Willie McKay on Saturday night stood accused of continuing to help broker Premier League transfers without a licence to do so, a year after revealing his role in Emiliano Sala’s tragic move to Cardiff City.

The man who also booked Sala’s fatal flight was even said still to be acting on behalf of Nantes by trying to find a buyer for the striker’s former team-mate, Abdoulaye Toure, before the January window closed on Friday night.

The Scot’s alleged involvement in that and another potential last-minute deal was condemned by Cardiff, who last week lodged a complaint with French prosecutors over issues relating to Sala’s death.

The Sunday Telegraph has learnt that the complaint included a demand for an investigation into whether McKay or Nantes had broken French laws banning people from working as, or using, unlicensed agents.

Cardiff chairman Mehmet Dalman, who has long called for a crackdown on such agents operating in football, said of McKay’s alleged ongoing relationship with Nantes: “I’m not here to comment [on] how other people run their clubs and the ethics they run it [with], but that’s just insane. And, quite honestly, it’s not just Nantes. There are two other clubs.”

McKay and Nantes failed to respond on Saturday after being asked if he had been trying to help broker a move for Toure to the Premier League.

The midfielder was linked during the window with West Ham United, who were also said to have been offered another player McKay is said to have tried to place, Amiens striker Serhou Guirassy. McKay’s son, Mark, reportedly had mandates to find buyers for both players.

Unlike his father, Mark McKay is a registered intermediary and West Ham co-owner David Sullivan confirmed he had offered the club players during the transfer window. Sullivan did not respond to questions about whether Willie McKay had also been in touch.