Sam Allardyce has said that any West Ham United supporter who steps out of line at Sunday's derby against Tottenham Hotspur should "suffer the consequences," as both clubs issued statements that appealed for respect at White Hart Lane.
The corresponding Premier League fixture last November was marred when home fans were subjected to anti-Semitic abuse from a small section of the visiting West Ham support. Tottenham fans had been attacked in Rome only days beforehand, having travelled to watch the Europa League tie against Lazio, and West Ham supporters chanted "Viva Lazio," and "Can we stab you every week?" There was also hissing from the away seats.
West Ham have told their fans that any such behaviour will result in a banning order and potential criminal charges, and Allardyce reinforced the message. "The club has made a statement so you will suffer the consequences if you do anything like that. If they do it, I think that's very important that they are identified and they suffer the consequences.
"We live in this society today so if you're made aware of what's acceptable and what's not you've got to be very, very careful about what you choose to chant. If you're made aware of it and it happens, you don't have any excuse. My message to the fans would be: support the lads on the field and forget about everything else."
Tottenham and West Ham will not tolerate racist or offensive language from their fans and each club statement was strongly worded. "Any fan found to be acting inappropriately - including racist, anti-Semitic and homophobic behaviour - will be punished to the full extent of the law and banned from attending matches," West Ham said.
Tottenham said: "The club does not condone discrimination of any sort, on the pitch or in the stands, and our stewards shall take action against anyone heard using abusive, offensive or obscene language."
The Metropolitan police will adopt a zero tolerance stance to any form of abusive behaviour and, in particular, their officers will listen for any anti-Semitic abuse and that includes the use of the word "Yid," which some Tottenham fans use to describe themselves.
The Met says that it is empowered to arrest anybody who uses the term, although officers will use their judgment over whether this is necessary. "We should like to ask all fans to be mindful of their use of this term," Tottenham said.