David Sullivan attended West Ham's Carabao Cup match against Portsmouth at the London Stadium on Saturday, despite him being advised to stay away from home matches.
On Monday, a spokesperson for London Stadium told Sky Sports News it had "recommended" to West Ham that Sullivan does not attend matches because of concerns about fan unrest.
Sullivan resigned as a director and joint chairman of West Ham in June, before the publication of an investigation by The Times and BBC Panorama into sexual misconduct allegations. He has strongly denied all allegations of wrongdoing.
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