Sebastian Coe has warned that the IAAF will review the award of the 2021 world athletics championships to Eugene if French prosecutors uncover evidence of corruption.
The IAAF president is awaiting the results of an investigation into the possibility of money-laundering, corruption or other crimes in the decision to award the event to Oregon without an open bidding process.
In an interview with The Times, in which Coe also cast doubt on Russia's ability to reform rapidly and admitted the task of restoring his sport's image may outlast his tenure, he was asked if a re-vote for the 2021 event was an option.
Coe said: "If anything comes out that shows those decisions were made on anything other than the reasons we believe then we have to review them and review them quickly. We will pull them in."
He also questioned whether Russia could complete a clean-up revolution in just four months; the country was accused of operating a vast, state-sponsored doping program in a report by a World Anti-Doping Agency commission and banned from international athletics last November.
"Nobody realistically expects to have a complete resolution to a problem people will recognise from even before my time as an athlete," Coe told the British newspaper.
Russia will find out in May if it will be able to send an athletics team to the Olympic Games in Rio, after being told "further significant work" is required before its international suspension is lifted.
Coe is fighting to restore the integrity of athletics after his sport was rocked by doping and corruption scandals. Five other nations -- Ethiopia, Morocco, Kenya, Ukraine and Belarus -- have all been told by the IAAF to make stern changes to their anti-doping programmes or risk joining Russia on an international athletics blacklist.
However, with a contract until 2019 as president, he said: "The return to trust may be beyond my time. That can't bother me. I can't say I need to be president when that happens. I probably won't be.
"We will get the reforms across the line and then I'll make judgments about what I want to do with the rest of my life."