A section of Chelsea fans engaged in anti-semitic chanting about Tottenham Hotspur at Saturday's game against Leicester City while singing about Chelsea's new star striker, Álvaro Morata.
Morata scored his third goal for Chelsea since his club record move from Real Madrid to open the scoring.
Fans were keen to make their adulation of the Spain worldwide known by chanting his name at the King Power Stadium, while also taking aim at London rivals Tottenham Hotspur. "Whilst we welcome the club's swift condemnation of this repulsive singing, Chelsea must now either identify and the punish fans who participated, or the club itself should face strict penalties from the Football Association to send a clear message to its fans".
"Since I arrived, I have been able to feel your (the Chelsea fans') support every single day", Morata wrote on his Twitter account.
"I don't think Antonio was aware of the song", Chelsea spokesman Steve Atkins said.
It is not the first time Chelsea fans have been caught making offensive chants in recent years. "But the language in that song is not acceptable at all".
Ross Kinnaird GettyImages
Videos appeared on social media of some supporters singing anti-Semitic songs before their FA Cup semi-final against Tottenham in April.
They stopped him boarding a Paris Metro train before a Champions League match at Paris Saint-Germain.
After the narrow victory at the King Power Stadium, Morata told the club's website: "It was a very important win".
Chelsea are certainly on firing form again, and look like the side who won the Premier League title last season.
Jamie Vardy pulled one back from the penalty spot but Conte's team held on for the three points.
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