In a statement on the club's website, the remaining board members said: "We want to thank Roger and Neil for their hard work and commitment to the club.
"There will be further changes to the board. An announcement about the executive management structure at the club will be made in the near future."
Munby and Doncaster added: "Delia, Michael and the Foulger family have worked tirelessly for the supporters.
"They have put huge amounts of their own money into the club over the last 13 years.
"They, and City supporters everywhere, deserve much more success than has been possible in recent years."
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