Mr Sharp's appointment is under review following successive reports in the Sunday Times that he helped Mr Johnson secure a loan before getting his job.
The paper's latest story cites a leaked Cabinet Office memo from December 2020. Officials have declined to comment.
Both men deny any wrongdoing.
They have separately said that Mr Sharp was not involved in arranging a loan for the then-prime minister, and say that neither man acted with any conflict of interest.
In the wake of the Sunday Times's fresh report, a spokesman for Mr Johnson insisted to the BBC that he had never received or sought financial advice from Mr Sharp.
Mr Sharp has resisted calls to stand down from his job.
网友评论