Giving evidence to the House of Commons select committee on culture, media and sport in London today, Warner said there had been allegations of "brown envelopes" and bribe demands.
Warner said he had learnt of the referrals from the IAAF itself but refused to name the "very senior IAAF person" who had passed on the information.
London was awarded the 2017 world championships ahead of Doha, with the Gulf city subsequently winning the vote for the right to stage the 2019 edition.
Earlier in January, Warner had said: "On the night before the bid a very senior person in the IAAF hierarchy told me and my bid team that certain members of the IAAF council were being called upstairs one by one to a hotel suite to be given a brown envelope."
British middle distance great Sebastian Coe is now the president of the IAAF. Asked if Coe had been one of his informants, Warner said today: "It could have been any number of people."
Coe was a senior member of London's bid team at the time of the vote in December 2011, and he succeeded Lamine Diack as IAAF president in August.
London eventually won the right to host the 2017 tournament after stumping up $7.2 million for prize money, but Warner has called for an investigation into the bidding process.
In response, Coe has said there will be an investigation into the claims.
Qatar is no stranger to investigations on the sporting front and is already facing a Swiss probe into how it was picked to host the 2022 football World Cup.
That Swiss probe is running parallel to a US justice department investigation into corruption at football's world governing body, FIFA.
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