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A staff "Christmas party" was held last year at the office of the man investigating lockdown parties at Downing Street.
Top civil servant Simon Case is due to report shortly on claims Covid rules were broken at events for staff in the run up to last Christmas.
But the BBC has been told that Mr Case's position as chair of the inquiry is now under consideration.
The Cabinet Office has been asked to comment.
The BBC understands a quiz was held for members of Mr Case's private office on 17 December 2020, and invites were sent out titled "Christmas Party!"
About 15 people were invited to the gathering at 70 Whitehall, near Downing Street, although it is understood not everyone turned up.
The BBC has been told that while Mr Case did not take part in the Christmas quiz, he was present for the event.