OJ Simpson will return to the Las Vegas courthouse where he was convicted of leading an armed sports memorabilia heist to ask a judge for a new trial on the grounds that his lawyer botched his case.

Simpson will take the witness stand next week to testify that the Florida lawyer who collected nearly 700,000 dollars is to blame for his armed robbery and kidnapping conviction in 2008 and his failed appeal to the Nevada Supreme Court in 2010.

Simpson's testimony in open court will offer a first look at the ageing 65-year-old former football star since he was handcuffed and sent away to prison more than four years ago.

Simpson didn't testify at his Las Vegas trial or in the historic case that led to his 1995 acquittal in the murder of his ex-wife and her friend in Los Angeles.

Instead of an expensive suit and tie, Simpson will be dressed in blue Nevada Department of Corrections clothing - greyer, heavier and limping a little more from old knee injuries, friends say. He is now Nevada inmate No. 1027820, a far cry from his playing days when Simpson wore jersey No. 32, won the Heisman Trophy, earned the nickname The Juice in the NFL and gained induction into the Pro Football Hall of Fame.

Simpson is scheduled to be in Clark County District Court beginning on Monday for the entire five-day hearing. He could testify Wednesday before a judge who has agreed to hear 19 separate points, mostly claiming that lawyer Yale Galanter provided such poor representation that Simpson deserves a new trial.

Simpson is serving a nine-to-33-year sentence that makes him first eligible for parole at age 70.

If he wins a new trial, prosecutors would have to decide whether to retry him for an incident that happened in September 2007 or offer a plea deal sparing the time and expense of another trial.

In a sworn statement outlining his upcoming testimony, Simpson said he told Galanter in advance that he planned to confront two collectibles dealers in Las Vegas and retrieve what he expected would be family photos, heirlooms and personal sports mementoes items that he believed had been stolen from him after his "trial of the century" in Los Angeles.

"I fully disclosed my plan to Yale Galanter, and he advised me that I was within my legal rights," he said.

Simpson claims that at trial, Galanter told him he didn't need to testify because prosecutors failed to prove their case, and didn't tell him about a plea offer by prosecutors that would have given him a minimum of two years in prison.

"Had I understood that there was an actual chance of conviction, I would have accepted such an offer," Simpson said.

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