Police have confirmed an incident involving Chelsea supporters and more anti-Semitic chanting on a train after Sunday’s match at Brighton.

Three fans were approached by officers on a day when the London chairman Bruce Buck had greeted away fans at the turnstiles before the kick-off and pleaded for calm and respect.

It is a third embarrassing incident in eight days for Chelsea, beginning with an allegation of racist abuse aimed at Manchester City’s Raheem Sterling during a match at Stamford Bridge.

Three Chelsea fans were spoken to by police over anti-Semitic chanting on a train

Anti-Semitic songs were then heard during the early stages of a Europa League tie against Vidi in Budapest, Hungary.

“Three men were spoken to by officers but at this time no one has come forward to make a complaint,” said a spokesman for British Transport Police, in relation to the singing on the train at Brighton.

Chelsea issued a strong statement after the game against Vidi, on Thursday, in which they described the chants in the away end as “abhorrent” and promised “the strongest possible action” against those “who can’t summon the brainpower” to understand such language will not be tolerated.

Officials from Stamford Bridge are working with the Hungarians to acquire CCTV footage in the hope of identifying culprits inside the stadium in Budapest.

Chelsea owner Roman Abramovich is Jewish and his club has long been at the vanguard of campaigns to banish anti-Semitism and other forms of discrimination.

Frank Lampard led a Kick It Out initiative in 2011 to raise awareness about the Y-word and the reasons it is insulting to Jewish people.

There has been evidence of success with some of the most offensive songs about London rivals Tottenham heard less often and a new song about Alvaro Morata, which featured the Y-word, quickly eradicated after please from the player and the club.

Still, problems linger on and regularly flare up and Chelsea are determined to pursue their policy of zero tolerance.

Four supporters have been suspended in relation to the incident involving Sterling and the club will wait for the police to conclude their investigation before they impose any private sanctions.