The Russian Football Union were fined £22,000 by FIFA for racist chanting in a March friendly against France in St Petersburg, one of several incidents prompting concerns ahead of the tournament which kicks off this month.
Protocols are in place if anything flares up during matches, England manager Gareth Southgate has said, while defender Danny Rose has told his family not to travel to Russia to cheer him on.
Gareth Southgate says racism is “completely unacceptable” and he has a plan in place for England at the World Cup if they suffer abuse
In conversation with the England players, William said: “Hopefully there is no racist stuff. Hopefully we won’t see any of it.”
William, who will not attend the World Cup, then added: “I will come down on it like a tonne of bricks.”
The Duke met Southgate and captain Harry Kane before speaking to the England players at West Riding County Football Association in Leeds ahead of their friendly against Costa Rica.