The club is co-owned by Manchester United's 'Class of '92', including Gary and Phil Neville, Nicky Butt and Paul Scholes.
Bernard Morley and Anthony Johnson, who have brought the club into the Vanarama National League, have left citing 'irreconcilable differences'.
In a statement, Gary Neville said: "The last four seasons with the managers have been the most successful in the club’s history and a huge part of that is down to Anthony and Bernard, so this announcement is regrettable.
"However after a meeting this morning between myself, senior management and the managers it was clear there were differences between us that could not be resolved and it was therefore decided to part ways, and whilst this is disappointing, it is the right decision for all concerned."
Their co-owners are aiming to get the club into the Championship withing 15 years.