A report on jewishwebsite.com claims Chelsea supporter Jonathan Metliss heard the chants from fellow Blues fans at Vicarage Road on Monday.
According to the article, Metliss, who is the chairman of the Action Against Discrimination charity, took pictures of the alleged perpetrators and reported the incident to nearby stewards before being moved to the family enclosure "for his own safety".
Chelsea, United face defeats as City surge forward
Chelsea last week launched a 'Say No to Antisemitism' campaign as part of their own inclusion work.
Blues owner Roman Abramovich was joined by members of the Jewish community ahead of the January 31 match against Bournemouth, which saw the lighting of a candle by Holocaust survivor Harry Spiro.
Following the emergence of allegations at Vicarage Road, Chelsea issued a strongly worded statement on Tuesday and have launched an investigation in co-operation with Watford and the police.
Premier League clubs spend record £150m on transfer day deadline
"Antisemitism has no place in our club, football or wider society," said a Chelsea spokesperson. "Anyone found guilty of antisemitic language or behaviour will face action from the club, including bans, and will be asked to attend equality education courses. We welcome the fact that Chelsea fans have reported this behaviour, which shames our club. We will be working closely with the police and Watford to identify those responsible and will take the appropriate action."
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ