Controversial police chief Ali Dizaei has been given the go-ahead to challenge his conviction for misconduct and perverting the course of justice.
The former Scotland Yard commander was found guilty for a second time at a retrial in February.
Dizaei was first convicted of framing young businessman Waad al-Baghdadi in a street row in 2010 but the conviction was quashed by the Court of Appeal a year later.
After the second trial he received a three-year prison sentence at London's Southwark Crown Court.
This was reduced by the 15 months he had already spent behind bars and he has been released.
Iranian-born Dizaei, from Acton, west London, was jailed for four years after being convicted of the same offences in February 2010.
He was sacked by the Metropolitan Police in May following internal disciplinary proceedings.
It was confirmed on Wednesday that Dizaei has been granted permission to challenge his second conviction at the Court of Appeal.
No date has been fixed for a hearing, but it is expected to be in the autumn.
Dizaei's solicitor Imran Khan said in a statement: "We are pleased that the Court of Appeal has granted Dr Ali Dizaei permission to appeal his conviction.
"Dr Dizaei has always maintained that the jury should have been made aware of the allegations made against the complainant, Waad Al Baghdadi, by others.
"Such allegations should not have been limited to any extent. This is particularly so, given that the credibility of both parties was at the heart of the case.
"The refusal to permit the allegations to be put before the jury severely prejudiced Dr Dizaei's defence.
"Dr Dizaei is anxious for the Court of Appeal to hear his appeal as soon as possible."