Asif and Shoaib are determined to contest their suspensions

His team-mate Shoaib Akhtar, who received a two-year penalty, has yet to file an appeal.

A Pakistan Cricket Board official said a tribunal would give a verdict on Asif's appeal "within seven days".

Asif has been suspended for a year but, in his first public statement about the matter, denied knowingly taking nandrolone and said: "I will fight it."

Interview: Shoaib Akhtar's doctor Hamed Tosif Razaq

The 23-year-old has emerged as one of the most promising new-ball bowlers in international cricket over the past few months, claiming 30 wickets in six Tests at a cost of just 21 runs each.

"Sometimes you go through a crisis, like you don't get wickets or you are out of favour with selectors - but this is something I never thought of," he added.

"I have earned a name only on my God-given abilities and not on anything else. I knew nothing about doping."

Shoaib is very confident that, given a fair trial with the evidence we are going to be presenting, he will be acquitted Dr Hamed Tauseef Razzaq

His appeal is to be heard by retired judge Fakhruddin Ebrahim, former Test player Hasib Ahsan and Dr Danish Zaheer.

Shoaib's doctor Hamed Tauseef Razzaq said: "We will show the world he is innocent.

"Shoaib has not cheated. He would never cheat and let his country or himself down. We're going to go all the way."

It was thought there were traces of the steroid, nandrolone, in nutritional supplements Asif and Shoaib were taking.

Dr Razzaq says a panel of experts will prove the duo did not deliberately break rules.

"They will beyond doubt show how you can test positive for nandralone without taking it," he added.

"These boys have been taking food supplements available over the counter. They are legal herbal medicines and they can cause positive nandrolone tests.

"It doesn't mean they have been using illegal drugs to enhance their performance or speed up their recovery.

"Shoaib is very confident that, given a fair trial with the evidence we are going to be presenting, he will be acquitted."

Meanwhile, the Pakistan Cricket Board, which has cancelled Shoaib and Asif's central contracts, says it will revise deals given to other players in line with their zero tolerance policy on doping.