Olympics chief Sebastian Coe was forced to deny today he was "unhappy" with the prospect of Boris Johnson becoming Mayor.
The Tory peer was reported as having doubts about the Tory candidate's ability to run London and, crucially, the 2012 Games.
Dave Higgins, chief executive of the Olympic Delivery Authority, also denied he was "unimpressed" with Mr Johnson.
A senior aide to Ken Livingstone had told the BBC the pair were concerned about the future of the Games under a Tory administration.
However, Tory insiders suggested the Mayor's officials-were simply trying to cause trouble by casting doubts over their candidate's competence.
A spokesman for Lord Coe said: "This is complete fabrication."
A spokesman for London 2012 added: "We have had constructive and positive conversations with all three main candidates for the mayoral elections and are confident we can have a very good working relationship with all of them.
"Any suggestions to the contrary are categorically untrue. Those comments were not made."
