Rooney is currently busy preparing his Derby side for the new Championship season, which kicks off in a fortnight's time The midlands club are currently under a transfer embargo, preventing them from signing players, after failing to provide financial records from previous years.
On Saturday he vowed he will not walk away as manager, but warned the club it would be 'impossible' for him to field a team for the start of the new Sky Bet Championship season without significant signings.
Her resignation was formerly accepted two days later.