West Ham United have banned a group of fans over their actions in a video taken during a game at London Stadium.
A clip on social media shows one man putting white powder on the bald head of a man in front of him, and another appearing to sniff the powder.
The Premier League club said "there is no place for this kind of behaviour".
"The club is disgusted by the contents of the video and acted swiftly to identify the offenders," said a spokesperson for the Hammers.
"In line with our zero-tolerance approach, details of the offenders were immediately passed on to the police, and all individuals had their season tickets suspended and are therefore unable to enter London Stadium and travel with the club for away fixtures.