Chelsea have called in the police to investigate after anti-Semitic abuse was directed towards midfielder Yossi Benayoun on Twitter, Press Association Sport understands.
Israeli Benayoun revealed earlier on Tuesday that he was subjected to abuse on the social media site, retweeting a message which contained expletives and referred to him being Jewish, after he had thanked his followers for their birthday greetings.
"Some nice people in the world," said Benayoun in response.
It is now understood the London club have contacted the police to investigate the matter further.
Last month Chelsea said they would investigate after Benayoun, who is out of contract at the end of the season, said he was the victim of anti-Semitic taunts from his own supporters when he came on as a substitute against Liverpool.