Arsenal manager Arsene Wenger fears the recent trouble at West Ham could influence the discussion over whether safe standing should be reintroduced at Premier League grounds.
Opposing fans clashed during the Hammers' EFL Cup victory over Chelsea in midweek at the club's new London Stadium, which has seen other minor incidents of violence since West Ham moved in at the start of the campaign.
The club have warned they will ban up to 200 supporters if they can identify those responsible for instigating trouble, though Gunners manager Wenger, the longest-serving boss in the country, does not fear football hooliganism is on the rise again.