Mayor of London Boris Johnson has indicated that the assistant commissioner of the Met, John Yates, will be investigated by the Metropolitan Police Authority.
The MPA's Professional Standards committee will meet on Monday morning, Johnson said, where "questions surrounding other officers" will be discussed.
Speaking to BBC Radio 4, Johnson also said that he was "very, very angry" that City Hall was not told about the Metropolitan Police's employment of Neil Wallis, the former-News of The World executive arrested last week.
"Clearly there are now questions about [Yates'] relationship with Wallis and all the rest of it and I'm sure that the MPA is going to be having a look at it."
However Johnson said that he did not tell Met commissioner Sir Paul Stephenson to resign.
The mayor said that "there was a real sense of disappointment in City Hall" and that he felt personally "hacked off" when the relationship between Wallis and the Met was revealed. He said that he and Stephenson had discussed police corruption several weeks ago, and said that at the time he felt the issue was "the dog that hadn't barked".
Johnson praised Stephenson as a "very proud, passionate policeman" and said that he had resigned because he didn't want the Met or the commissioner to be "distracted" by questions surrounding phone hacking.
He added that as a victim of phone hacking he "won't shed a tear" if those responsible are convicted.