West Ham have urged supporters to remain seated at their new home, the Olympic Stadium, this season or risk having their season ticket 'permanently revoked'.
The Hammers have played two matches at their new ground, against Domzale and Juventus, and are preparing for their first Premier League season at the former London 2012 Olympic venue after moving from the historic Upton Park.
However, the east London club have been concerned by fans having their 'view spoiled by individual fans or small groups who are standing up throughout' in the opening two matches.
In a bid to prevent 'children, elderly supporters and, in particular, those with disabilities' having their enjoyment affected when the top-flight season begins, the club have sent an email to fans urging them to remain seated.