Police are investigating claims that West Ham supporters threw coins at Frank Lampard following his 200th goal for Chelsea at the weekend.
In a statement, West Ham said:
"West Ham United will be working with Chelsea to investigate the reports of missile throwing during Sunday's game at Stamford Bridge.
Any individual found to have acted in an inappropriate way will have to face the consequences of their actions, including the possibility of a ban from attending future matches."
More top news
Pregnant woman who was labour has had her "phone snatched while calling for and ambulance to hospital".
It will be increasingly cloudy this evening, with sporadic outbreaks of rain or drizzle spreading in during the first half of the night.
A derelict north London garage has gone on sale for £360,000 - more than the cost of a flat on the same road.