The Argentina defender has asked for a three-man panel to decide whether United gave him permission to leave the club for an agreed fee.
Heinze wants to join Liverpool and claims he has a letter from United allowing him to leave if a club offered a fee of £6.8million. The club maintain however that they made it clear to Heinze both orally and by letter that he would not be permitted to join one of their title rivals in the top flight.
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