West Ham and Charlton have postponed Carling Cup home matches which were due to take place on Tuesday night night on the request of police after three days of rioting in London.
The Hammers were set to host Aldershot at Upton Park while Reading were scheduled to travel to Charlton.
However, both games have been called off, with the police needing to concentrate their resources elsewhere.
Crystal Palace are also set to play Crawley at Selhurst Park on Tuesday. That may also be affected, given the stadium is close to the scene of Monday's disorder in Croydon.
England are due to play a friendly international against Holland on Wednesday night at Wembley, a match which may also be impacted by the trouble in the capital.
West Ham's game was the first to go, with the npower Championship side saying on their website: "West Ham United have been asked by the police to postpone the Carling Cup first-round tie with Aldershot Town tomorrow night.
"The club were contacted this evening and told that all major public events in London were to be rearranged because of the need to focus police resources elsewhere.
"Whilst neither the club or police anticipate any issues around the game itself, the club has to comply with the police request.
"No date has yet been set for the rearranged match but the club will be in contact with the Football League and Aldershot."
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."
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