Everton have condemned the "threatening, racist and misogynistic" social media abuse aimed at the wife of striker Dominic Calvert-Lewin.
Sandra Calvert-Lewin posted a message in support of her husband, whose contract expires at the end of the season, after Saturday's final game at Goodison Park against Southampton.
The message received a backlash from some supporters whom both Everton and Merseyside police have indicated they are seeking to identify.
Everton said in a statement: "Everton Football Club strongly condemns the threatening, racist and misogynistic abuse directed towards the wife of Dominic Calvert-Lewin on social media.
"This sinister and intimidating behaviour is not only deeply hurtful and distressing, it is also criminal - and does not represent the values of Everton or the overwhelming majority of our supporters.
"The club has a zero-tolerance policy towards all forms of discriminatory and abusive behaviour.
"We are working closely with Merseyside Police and the Premier League to ensure the individuals responsible are identified and held accountable for their actions.
"Threats or abuse or any kind - whether online or in person - are completely unacceptable and have no place in our game or in society.
"The club urges anyone who sees of experiences such behaviour to report it to the authorities and relevant social media platforms immediately.
"We will continue to offer our full support to Dominic and his family."
Merseyside Police have confirmed they are aware of the comments and are working with Everton to find the culprits.
A spokesperson for the force said: "We are aware of racist and threatening social media comments directed towards the wife of Dominic Calvert-Lewin.
"To send such abhorrent messages to anyone online is utterly appalling and we are working with Everton Football Club as part of our initial enquiries.
"We take these reports extremely seriously and would like to remind social media users that any belief that they can maintain anonymity online to commit offences is misplaced.
"Offences committed online, which includes making threats and racist abuse, can be investigated."
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