A Manchester City fan was spotted making monkey noises and gestures in the direction of Manchester United midfielder Fred in Saturday's derby.
The footage was captured by Sky Sports' cameras during United's 2-1 win at the Etihad Stadium which appeared to show a man directing his disgusting actions towards the Brazilian.
Sportsmail understands the incident was seen by Man Utd officials on their phones and passed on to stewards who reported it to the control centre where all the CCTV is.
Footage appears to show a Manchester City fan making monkey gestures at Fred
The Manchester United midfielder was subjected to gestures as well from the supporter
The fan was there for a while afterwards but it is unclear at this stage if he left or was kicked out.
Fred had already been struck on the neck by an object thrown by a Manchester City fan when he went to go and take a corner for his side.
But the horrific actions continued and Manchester City have released a statement after the game.
Manchester City insist they are aware of the situation and will help with enquiries
It stated: 'Manchester City FC are aware of a video circulating on social media which appears to show a supporter making racial gestures during the second half of the match against Manchester United this evening.
'Officials from the Club are working with Greater Manchester Police in order to help them identify any individuals concerned and assist with their enquiries.
'The club are also working with GMP regarding an instance of objects being thrown onto the field of play.
Fred had been hit with an object thrown from the crowd in the Manchester derby
'The club operates a zero tolerance policy regarding discrimination of any kind, and anyone found guilty of racial abuse will be banned from the club for life.'
Marcus Rashford was asked after United's victory if he had heard about the chanting at Fred, and he replied: 'It can happen and I think in recent times we've been dealing it better but it shouldn't happen.'
Kick It Out have also tweeted that they will be in contact with the clubs after posting a tweet on social media.
But the awful incident did not prevent his side from securing a victory over their neighbours
It read: 'We have been inundated with reports of alleged racist abuse from a number of individuals during this evenings Manchester Derby.
'We will be contacting both clubs to offer our support and hope swift action is taken to identify the offenders.'
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