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Lord Sebastian Coe, the president of athletics' embattled world governing body, will on Wednesday appear before MPs to answer questions on the handling of athletics' doping scandal.
Coe is to give evidence to the culture, media and sport select committee investigating blood doping in the sport following revelations made in The Sunday Times in August.
The IAAF president will be quizzed about the world governing body's response to doping allegations, including the former Olympic 1500 metres champion's remark in August that investigations into suspicious blood results amounted to "a declaration of war on our sport".
He has since insisted he was only referring to stories which had tainted the reputation of clean athletes.
Coe can also expect questions on his association with sportswear giant Nike.
He denied a conflict of interest - a charge levelled by committee member Damian Collins, among others - but last week ended his 38-year ambassadorial role with Nike.
Nike sponsors Russia's athletics team, the first country to be banned from international competition due to doping offences.
The sanction was imposed in the wake of damning revelations by the World Anti-Doping Agency of systematic doping and cover-ups in Russia.
American sprinter Justin Gatlin, who has been banned before returning to the sport, is another of those sponsored by Nike.
The company has close links to Eugene, which was awarded the 2021 World Championships without a vote, something which is also likely to be on the committee's agenda.
Paula Radcliffe in September went public to defend her name, claiming she had been effectively identified by the committee of MPs as having provided suspicious blood samples.
The marathon world record holder was last week declared innocent of any blood doping by the IAAF and WADA.