Guede, 29, is almost half-way through a 16-year jail term, but in a judgement that had serious implications for Knox and Sollecito, the judge in his trial ruled that he could not have acted alone.
In an interview with La Repubblica at the prison in Viterbo, Guede said: “If Knox and Sollecito are innocent, then so am I.”
Italy’s Court of Cassation quashed a murder conviction against Knox and Sollecito on March 27th, bringing a sensational end to an eight-year-legal drama.
Guede described himself as an “impossible convict” and the “accomplice of a crime without a culprit”.
Along with his lawyers, he said is is now waiting for the high court to gives its justification for the recent ruling.
“I want to arrive at a situation where my case will be reviewed,” he told La Repubblica.
“I am convinced we will find new elements to swing the verdict.”
Knox and Sollecito served four years in prison for the murder before being acquitted in 2011.
But that decision was found to be flawed by the Court of Cassation in 2013, leading to a retrial in Florence which reinstated the initial convictions last year and increased Knox's sentence to 28 years and six months.
Kercher, 21, died after being stabbed 47 times and having her throat slashed. Her half-naked body was found in a pool of blood in a back room of the house she shared with Knox on November 2nd 2007
By Anna Pujol-Mazzini