Former Pakistan pace bowler Mohammad Asif has appealed to the Court of Arbitration for Sport against his seven-year ban for spot-fixing.
The International Cricket Council's suspension was handed down last February relating to deliberate no-balls bowled in the Lord's Test against England in August 2010.
The jailed seamer's lawyers - London-based SJS Solicitors - have confirmed they have also filed an appeal against his criminal conviction to the Court of Appeal after he was imprisoned for a year following the criminal trial at Southwark Crown Court in November.
A spokesman said: "The appeal filed to the Court of Arbitration for Sport against the ICC ban is founded upon multiple grounds that include the argument that the ICC Disciplinary Tribunal breached its own procedures, and in other ways infringed fundamental human rights to which Mohammad Asif is entitled.
"In such a situation the ICC ban is not only flawed, it could also be unlawful."
The spokesman added: "A separate appeal against the conviction has been filed in the Court of Appeal."
Asif, who is currently serving his custodial sentence at HM Prison Canterbury, was banned from all forms of cricket for seven years - two suspended - in February last year relating to spot-fixing allegations in the fourth Test against England.
The former world number two Test bowler, 29, was found guilty last year and received a 12-month prison term for delivering one of the fraudulent no-balls.
Salman Butt, Pakistan's captain at the time, and young bowler Mohammad Amir were also banned by the ICC and convicted in November's trial.
Butt was banned for 10 years - with five suspended - and jailed for 30 months after being found guilty of being the "orchestrator" of the spot-fixing, while Amir was banned for five years and detained for six months in a young offenders' institution after he admitted bowling two intentional no-balls.