No 10 confirmed the pair had received notification from the Metropolitan Police that they would be given fixed penalty notices.
But a spokesman said they had not been told which event the fine was for.
The force is investigating alleged Covid law-breaking at 12 gatherings in Whitehall and Downing Street.
Meanwhile Labour leader Sir Keir Starmer has tweeted: “Boris Johnson and Rishi Sunak have broken the law and repeatedly lied to the British public. They must both resign.
“The Conservatives are totally unfit to govern. Britain deserves better.”



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