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."
More top news
Detectives are hunting two thugs armed with wooden stakes who left a man with multiple head fractures in a vicious attack.
Police have launched a manhunt following three attacks on women in south London that detectives say may be linked.
Khan, the Labour MP for Tooting, claims his plan to hold fares at 2016 prices until 2020 is fully costed.