Cardiff City football club launched an investigation into a player transfer after auditors discovered evidence of unexplained payments, The Daily Telegraph has learnt.

A loan deal involving Cardiff and West Ham United, who were managed by Sam Allardyce at the time, was examined after questions were raised over fees relating to the deal.

An agent is understood to have told the club that a payment had been agreed with Allardyce over the loan of Ravel Morrison, who moved to the Welsh club from West Ham in 2014.