Leading architect Ruben Reddy has said the London Stadium must have its athletics track removed if West Ham are ever to have the kind of atmosphere they want, reports BBC Sport.
The Hammers move from Upton Park has suffered a number of problems, with security a main issue.
Reddy, who helped build the stadiums for the Sochi Olympics, said: "They will have to change it. You will never get the atmosphere right as it currently is.
"You shouldn't keep the athletics track with the notion that some great athletics event is going to return. That is why I am saying that stadiums should not be looked at as multi-use with athletics and football. You can have football and rugby. If you want to keep an athletics track, put a cricket oval in there."