Dan Ashworth is reportedly going to argue that he was sacked by Newcastle in a bid to force through a move to Manchester United.
An arbitration hearing is due to begin later this month as the two clubs struggle to agree on a compensation fee.
Newcastle have been waiting for the Red Devils to make a reasonable offer, which so far has not gone beyond £2m.
Ashworth informed Newcastle of his wish to join Manchester United as their new sporting director in February and was placed on gardening leave, a period that minority owner Sir Jim Ratcliffe has suggested expires towards the end of 2025.