The Metropolitan Police has warned Charlton fans about their conduct, reports the London Evening Standard.
The warning comes after recent demonstrations about the clubs ownership.
Roland Duchatelet has been heavily criticised by Charlton fans for his ownership, with supporters hosting a mock funeral procession before the clubs game against Middlesbrough earlier this month.
They also caused disruption by throwing beach balls onto the pitch and blowing whistles from the crowd.
A statement from the Met was released on the Charlton website, reading:
“A reminder that the following is illegal and will be investigated: entering the field of play or adjacent areas; the throwing of any objects in the ground; racist or homophobic chanting; carrying or using pyrotechnics inside or outside the ground.”
However, the Coalition Against Roland Duchatelet have hit back at the statement, insisting that they will protest against Duchatelet at the next home game against Birmingham.
A spokesperson for CARD said: “CARD has been scrupulous about the nature of the protests it has organised, including liaising amicably and constructively with the police, and it is a huge mistake on the part of the regime to address the majority of Charlton supporters as if they are criminals.”