Newcastle United have confirmed that the police have been notified after striker Sammy Ameobi was racially abused on social networking site Twitter.
The club have vowed to take the "strongest possible action against those responsible" for the incident, which occurred two days ago.
"Newcastle United are aware of a racist remark that was directed towards Sammy Ameobi via Twitter on Sunday evening," read a statement from the club.
"The club and Sammy have reported the matter to the police, who are now dealing with the incident.
"The racist comment is wholly unacceptable. Newcastle United will not tolerate racism of any kind and will take the strongest possible action against those responsible."
Ameobi, 19, came on as a substitute during Newcastle's 3-1 victory at Stoke City last night.