Cardiff manager Malky Mackay has been told to resign or face being sacked by the Welsh club's owner Vincent Tan.
According to the Press Association, Tan sent Mackay an email on Monday, outlining his grievances over his signings, style of play, results and performance as a manager.
The letter also included the ultimatum that the Scot quit or be given the boot by the controversial Malaysian businessman.
A Cardiff spokesman told PA Sport: "The club is not party to any letter sent from one person to another."
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