West Ham's Carling Cup game against Aldershot on Tuesday has been postponed on police advice.
Some sports events have been affected after riots in London.
West Ham say the first round tie has been rescheduled for the evening of Wednesday 24 August.
said on their website:
"The club were told that all major public events in London were to be rearranged because of the need to focus police resources elsewhere."
The club added: "Neither the club nor police anticipate issues around the game itself, but the club has to comply with the request."
A statement from Aldershot read: "We understand many supporters will be disappointed with this announcement but confirm that the matter is out of the control of both West Ham United and Aldershot Town Football Club."