Scotland Yard has asked for "minimal reference" in civil servant Sue Gray's report into the allegations of lockdown-breakdown parties in Downing Street.
The Metropolitan Police said it had not asked for the report to be delayed or placed any further restrictions on other events but was in contact with the Cabinet Office team to "avoid any prejudice to our investigation".
Boris Johnson continues to anxiously await Ms Gray's report, which has the potential to trigger a vote of no confidence in his leadership by Tory MPs angered over alleged breaches.
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In a statement, Scotland Yard said: "For the events the Met is investigating, we asked for minimal reference to be made in the Cabinet Office report.
"The Met did not ask for any limitations on other events in the report, or for the report to be delayed, but we have had ongoing contact with the Cabinet Office, including on the content of the report, to avoid any prejudice to our investigation."
The statement indicates Ms Gray will either have to make significant changes to her report before publication or delay it until after the police inquiry concludes.
Sources close to the inquiry have previously indicated that she was concerned about the prospect of releasing a report that was short of some of its key findings.
Officers have not confirmed how many events they are investigating, but reports have suggested it could be as high as eight.
The official inquiry has been long-awaited but its publication was thrown into disarray on Tuesday when Met Police Commissioner Dame Cressida Dick announced that her officers had opened a criminal investigation.
