"We have filed a statement of appeal in the Lausanne-based Court of Arbitration for Sports (CAS) against the ban by International Cricket Council (ICC) anti-corruption tribunal," Yasin Patel told AFP by email from London.

Opening batsman Butt and fast bowlers Mohammad Asif and Mohammad Aamer were all banned on charges of corruption relating to last year's Lord's Test against England.

Butt was banned for 10 years, with five suspended. Asif was banned for seven years, two of which were suspended, with Aamer handed a five-year penalty.

Asif and Aamer have also hinted at appealing against the verdicts.

All three players are also facing criminal prosecution in England.