CHELSEA boss Maurizio Sarri has called for the club's fans to support their team and not sing offensive songs about League Cup semi-final opponents Tottenham.
Blues fans have been under the spotlight in recent weeks after a number of high-profile incidents including a derogatory chant about Spurs supporters, featuring alleged anti-Semitic language, at a Europa League match in Hungary last month.
Chelsea have adopted a zero-tolerance policy and officials and supporters from both clubs met last week to discuss stewarding and policing at Wembley on Wednesday morning (AEST).
Those present were told discriminatory chanting would not be tolerated, whether by an individual or groups of people.
"I think we need the support of our fans, of course. But we would like to have their support for us, not against the opponents," Sarri said.
Tottenham manager Mauricio Pochettino also called on fans not produce an unsavoury atmosphere.
"They need to support the players, nothing else. That is the most important thing for me. They need to create a good atmosphere and not to think about the emotion of hating each other," he said.
The Chelsea Supporters' Trust recently posted an article on the group's website reporting the experiences of two Jewish supporters, a mother and son, who discussed hearing anti-Semitic abuse at Stamford Bridge.
The son, known as Jack, said: "It has definitely got worse in recent seasons. It is a bit stupid and short-sighted though, especially as our owner, Roman Abramovich, is Jewish."