Spurs fan arrested over 'Y-word' chant
• Crace: The Y-word debate
On Thursday, Scotland Yard said both sets of supporters would be watched and that people could be committing an offence if they said it.
The issue has caused controversy because Spurs fans use the word -- a term for Jewish people that is often considered derogatory -- as an act of defiance to describe themselves and their club, which has long-standing links to the Jewish community.
However, it is also used by opposing sets of supporters to taunt the White Hart Lane side.
Despite the police warning, Tottenham fans sang "Yid army" and "We'll sing what we want" before kick-off, with the chanting continuing throughout the match.
Officers said a 51-year-old Spurs fan had been arrested after "committing a section five public order offence" in the East Stand during the half-time break. He will appear in court next month.
The corresponding fixture last season was marred by anti-Semitic chanting from a section of the West Ham support, and Hammers boss Sam Allardyce, along with club co-owners David Sullivan and David Gold, had urged fans to ensure the same thing did not happen again.
After the match, police confirmed that no arrests linked to any chants had been made among the travelling fans.
On Thursday, Chief Superintendent Mick Johnson, the match commander for the West Ham game, had said: "This topic has been debated at length but our position is clear -- racism and offensive language have no place in football, or indeed in society.
"Those supporters who engage in such behaviour should be under no illusion that they may be committing an offence and may be liable to a warning or be arrested."