The Metropolitan Police maintain a lack of a 'satisfactory radio system' at West Ham's London Stadium is preventing additional special policing services being put in place on match days.
West Ham have demanded that London Stadium owner E20 guarantees a police presence at future matches following crowd trouble during Saturday's 4-2 Premier League defeat to Watford.
An unspecified number of fans were ejected from the London Stadium after fights broke out in the closing stages of the game, although the Met Police have stated there were no arrests.
West Ham, who moved from Upton Park into the converted Olympic Stadium for the start of the new season, say they have specified 'essential important improvements' to increase the numbers of those involved in stewarding and the security operation, as well as the level of training and experience they have in dealing with Premier League matches.