The mayor of Liverpool has asked police to investigate whether any "fraud" has taken place surrounding Ross Barkley's transfer from Everton to Chelsea.
Joe Anderson has written to the heads of the Football Association (FA) and Premier League following the 24-year-old England midfielder's £15m move.
The "circumstance" of the deal "warrants serious investigation", said lifelong Everton fan Mr Anderson.
Merseyside Police said Mr Anderson's letter "is currently being considered". In the letter, on this official headed notepaper, Mr Anderson expressed concern about the size of the transfer fee paid by Chelsea for Barkley.
The Premier League champions had reportedly agreed to pay £35m in the summer, only for Barkley to pull out of the move to Stamford Bridge at the last minute.
Noting that Barkley did not play "a single minute for Everton" in the time between these two negotiations, he said the player has seen "a decrease in value of more than one million pounds a week".
He claimed: "At best, this represents a very poor deal for Everton Football Club.
"At worst, it could be seen as a deliberate attempt to drive down a player's value in the transfer market so as to benefit the player, his agent and the buying club," Mr Anderson said.
In the letter, Mr Anderson tells FA chairman Greg Clarke and Premier League executive chairman Richard Scudamore that he feels "it is right that the public receive an assurance on this matter".
Bill Kenwright insists he has ‘no concerns’ about Ross Barkley’s Everton exit. Barkley sealed a £15 million move to Chelsea last week, less than five months after he pulled out of an original £35m switch to the Premier League champions.
The Wavertree-born midfielder was in the final six months of his existing contract at Goodison Park contract and continually rejected offers of an improved deal.
That move prompted the Mayor of Liverpool to ask the police to investigate whether the transfer was subject to potential ‘fraud’ charges on the player’s part.
Joe Anderson also wrote to the Premier League and Football Association suggesting ‘collusion has taken place’ in Barkley’s departure from his boyhood club.
But Everton chairman Kenwright has shot down suggestions of any improproiety in the deal and credited the Londoners as ‘absolutely immaculate’ in negotiations.
He said: “I’ve got no concerns at all about what Joe’s said [and] I’ve got no concern at all about Chelsea, who were immaculate as they were in the summer.
“It was a deal we agreed because the boy didn’t want to play for Everton.