In a statement, the Metropolitan Police revealed that Andrew Mitchell attended both misconduct hearings for former Pcs Keith Wallis and James Glanville, as an "interested party".
The Met spokesperson said: "Misconduct hearings are considered a privateprocess. As such, we treat theinformation raised within them as confidential.
"This is set out in the statutory regulations governing police misconduct proceedings. However, given the public interest in this investigation the MPS, will publicise the outcomes of the hearings."
Andrew Mitchell, then chief whip, was involved in a heated confrontation with another police officer, Toby Rowland, after he was refused permission to cycle through the main gate of Downing Street on September 19, 2012.
Mr Mitchell, who was accused of calling the officer a ''pleb'', was forced to resign his post following a month of intense media interest in the story.
A former policeman at the centre of the "plebgate" row has said officers on duty at the gates of Downing Street have been "betrayed" by their Metropolitan Police bosses.
Ian Richardson said he believes his colleagues' claims that Andrew Mitchell called officers "plebs" and was "officious and rude", in an interview with The Times.
Despite not hearing the exchange, Mr Richardson said Pc Toby Rowland, the officer who claims he was sworn at by Mr Mitchell, immediately recounted what was allegedly said.
Mitchell, the Conservative MP for Sutton Coldfield, admits swearing at the officers but maintains that he did not use the other words attributed.
Mr Richardson accused the Metropolitan Police of failing the officers involved by concentrating on who leaked the story to the media rather than investigating what had happened and issuing a statement to clarify the incident.
The former officer, who retired with 30 years' service in October 2012, said Mr Mitchell should not have lost his job over a "quirky incident that should have blown over".
The ripples from Andrew Mitchell's short, bad tempered altercation at the Downing Street gate continue to spread.
ITV News has learned that the police watchdog has temporarily suspended its investigation into three police union representatives over their meeting with Mr Mitchell.
The officers from Mr Mitchell's local Police Federation branches gave an account of a meeting with him about the 'Plebgate' affair, which appeared to contradict a recording Andrew Mitchell made of the meeting.
The Independent Police Complaints Commission launched an investigation into the men after they appeared in front of the Home Affairs Select Committee. But the Federation then initiated legal proceedings saying the men had already been investigated and cleared.
The Federation took out an injunction against the IPCC investigation while a Judicial Review is heard. An IPCC source says it will not harm their investigation to wait for the outcome of the review and so they are not contesting the injunction.
An IPCC spokesman said: "We deeply regret the delay in concluding a matter of great public interest.
"However, as there would be no prejudice to our investigation if it is suspended pending the outcome of proceedings we do not wish to incur unnecessary costs from the public purse in fighting the interim application.
"As a result, we will not be in a position to complete our investigation pending the conclusion of this legal action."
The Federation has supported Pc Rowland with the provision of legal advicein respect of this matter. All subscribed members of the Police Federation areentitled to such support for legal representation as they see fit.
Andrew Mitchell will not be able to recover his legal costs of he wins his libel case against The Sun newspaper over the Plebgate affair, the Court of Appeal said today.
The Court of Appeal refused to overturn a ruling from High Court judge Master Victoria McCloud imposing the punishment after Mr Mitchell's lawyers failed to submit a budget for £506,425 of costs on time.
The ex-cabinet minister, who revealed his personal anguish over the affair yesterday, is suing The Sun over its report on September 21 last year about the incident at the gates of Downing Street which led to the so-called "Plebgate" affair.
It is unclear whether the MP, who was reported to be on a no-win no fee arrangement, will now need to meet the legal bill from his own pocket.