Managing director Lee Charnley said the decision was taken to safeguard the club's future.
But there has been little news of that developing since then and the club would not comment on reports the Premier League had been informed of the proposed bid.
The Premier League also had no comment to make.
Newcastle owner Mike Ashley was criticised last week after charging fans for season tickets in the 2020-21 campaign despite the Premier League being suspended because of coronavirus.
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