Conservative London Assembly member Andrew Boff said it still wasn't clear where the cash was coming from and who's paying for the transformation of the stadium.
Andrew Boff added: "We still don't really know, but chances are we're all contributing. Taxpayers shouldn't be paying for Premiership football clubs.
"The £154 million has to come from an already stretched LLDC budget and the knock-on effect is that the rest of the transformation of the park - the really important stuff such as housing - will suffer as a result.
"Only by ditching the requirement for the athletics track, are we likely to see more bids from the private sector, for a proper football stadium rather than the hybrid fudge we currently have."
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The pair have been poring over old maps and records in their bid to convince the council the warehouse should not be converted into flats.