Pakistan Cricket Board said on Saturday that both Afridi and Younis will appear "either in person or through teleconference, depending on their convenience and subject to their professional commitments."
The tribunal will conduct the hearing of Pakistan's suspended cricketers Salman Butt, Mohammad Asif and Mohammad Amir from Jan. 6-11 at Doha, Qatar.
Afridi led Pakistan in the Twenty20 series against New Zealand while Younis will be with the Pakistan team in New Zealand where the first Test begins Jan. 7.
Butt, Asif and Amir were suspended in September after a British tabloid alleged that they bowled predetermined no-balls during the Lord's Test against England.
"PCB is committed to root out corruption, in any form, from cricket and has a zero tolerance policy towards corruption," the cricket board said in a statement.
"PCB is also keen to assist the ICC anti-corruption tribunal in determining the truth behind the serious allegations being made against the three Pakistan players."
Local media reports earlier this week claimed that both Afridi and Younis had raised serious doubts over the role of the three players during the Lord's Test. Afridi reportedly told the ICC code of commission that he thought the trio looked guilty when he met them in a hotel room in London.
The reports also claimed that Younis was surprised to watch Amir bowling a huge front foot no-ball and even told the fast bowler 'what the hell was that?' during the break.
Source: ESPNstar.com
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