Equality campaigners have condemned homophobic chants allegedly aimed at Chelsea fans during the match at Old Trafford yesterday.
Manchester United drew 1-1 with the West Londoners yesterday afternoon in what was a key battle in the race to finish in the top four.
Kick It Out said they have received numerous reports of Chelsea supporters being called 'Rent Boys' in chants during the match and are now calling for both the police and FA to take action.
In a statement today they said: "We received further reports of 'rent boy' chants aimed at Chelsea fans yesterday, before and during their fixture against Manchester United.
"We repeat: the chant is homophobic and unacceptable - and the authorities, leagues and clubs must do more to eradicate it from football."
It echoes a statement made after Chelsea's defeat at Anfield earlier this month.
Liverpool apologised after the chant was aired during the game which they said was "inappropriate and offensive."
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Kick It Out said then: "The 'rent boy' chants have been directed at Chelsea for years - with little action taken by the FA or police - and that must not continue.
"We are absolutely clear the chant is homophobic and must be treated as such.
"We expect stronger condemnation and appropriate sanctions, just as we would for any other form of discriminatory chanting."
LGBT group Pride in Football have said previously: "Many LGBT + fans at Chelsea FC & elsewhere find the Rent Boy chant offensive.
"That slur & the raft of chants Brighton fans hear not only use words that demean but in their use there’s an assumption that no one in the stadium actually is gay."
There has so far been no response from United however the club have reaffirmed their commitment to inclusivity and diversity in the past few weeks.
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Their home game against West Ham was designated as their All Red All Equal game with posters erected around the ground.
The club also released a hard-hitting video containing several members of both the men's and women's first team squads being shown real-life racist, sexist and other discriminatory messages from social media and their reactions being filmed.
