Merseyside Police say they are investigating racist abuse sent to Liverpool striker Mario Balotelli on Twitter.
The Italian received the abuse after he tweeted 'Man Utd...LOL' during United's shock 5-3 loss to Leicester on Sunday.
The 24-year-old's post was retweeted more than 150,000 times and met with a string of racist and abusive messages.
A number of accounts that sent the abuse have since been closed down.
Police say they will first need to establish who sent the messages and where they originated from.
Anti-discrimination group Kick It Out tweeted that it is aware of the racist tweets sent to the former Manchester City player and will be reporting the incident to the relevant authorities.
Balotelli, who played in Liverpool's 3-1 defeat by West Ham on Saturday, has been singled out for racist abuse in the past.
He was heckled by Italy supporters during a pre-World Cup training camp in May and was on the receiving end of numerous instances of racist abuse during his time at Inter Milan and, more recently, AC Milan.