Former Tottenham player Sol Campbell, now at Portsmouth, was subjected to racist and homophobic chanting by some travelling fans during Pompey's game against Spurs at Fratton Park in September. The North London club has promised to ban for life any supporter found guilty of racist or homophobic behaviour.
Spurs safety officer Sue Telling has insisted that they will do their utmost to help the police in their inquiry.
Telling said: "The club does not tolerate any form of abusive or discriminatory chanting and we would ask fans with any information to please come forward and assist the police with their investigation into this matter.
"In order to ensure that matchdays are enjoyable for everyone we shall not hesitate to ban, indefinitely, supporters whose behaviour is proven to be unacceptable.
"The conduct of our supporters is taken very, very seriously and our fans are normally well behaved both at home and away grounds."