Manchester United are seeking specialist advice after they were contacted by anti-racism group Kick It Out over a song that has been heard at Old Trafford in support of the striker that refers to a racial stereotype.

Kick It Out has confirmed that it has spoken to the Premier League club following the emergence of video footage that featured a song about the size of Lukaku’s penis, which the campaign group have asked to be banned because it reinforces the stereotype that black men are better endowed than others.

The chant has not been used by fans in a derogatory or abusive way towards Belgian striker Lukaku, but The Independent understands that the club will now seek advice over the matter.

Manchester United vs Everton player ratings Show all 22 1 /22 Manchester United vs Everton player ratings Manchester United vs Everton player ratings David De Gea First keeper to stop a Leighton Baines penalty and then won his side all three points with a super late save. 8/10 Getty Images Manchester United vs Everton player ratings Rafael A solid performance in attack and defence. 7 Getty Images Manchester United vs Everton player ratings Paddy McNair Did well to negate Romelu Lukaku's physical threat. 6 Getty Images Manchester United vs Everton player ratings Marcos Rojo Didn't look totally at ease and had a fairly quiet game. 6 Getty Images Manchester United vs Everton player ratings Luke Shaw Not a great game, gave away penalty, lost Naismith for goal and went off injured. 5 Getty Images Manchester United vs Everton player ratings Daley Blind A solid game from the Dutchman in midfield. 7 Getty Images Manchester United vs Everton player ratings Antonio Valencia Not a great performance. Doesn't look totally comfortable in a midfield diamond. 5 Getty Images Manchester United vs Everton player ratings Angel Di Maria His great start continues, with a goal and an assist. 8 Getty Images Manchester United vs Everton player ratings Juan Mata In for suspended Rooney but didn't really grab his chance. 5 Getty Images Manchester United vs Everton player ratings Robin Van Persie Not a performance to right home about. 5 Getty Images Manchester United vs Everton player ratings Radamel Falcao Broke his United duck after missing a few earlier chances. 6 Getty Images Manchester United vs Everton player ratings Tim Howard An increasingly rare error-free game. 6/10 Getty Images Manchester United vs Everton player ratings Tony Hibbert Won his side's penalty but had an otherwise tricky time dealing with Di Maria. 6 Getty Images Manchester United vs Everton player ratings John Stones Another solid performance from the young defender. Late injury will be a concern for club and country managers. 7 Getty Images Manchester United vs Everton player ratings Phil Jagielka His (stunning goal last week aside) indifferent season continues. 5 Getty Images Manchester United vs Everton player ratings Leighton Baines Missed his first Premier League penalty, but made amends with assist for goal. 6 Getty Images Manchester United vs Everton player ratings Muhamed Besic Did what was needed without excelling particularly. 6 Getty Images Manchester United vs Everton player ratings Gareth Barry Reliable rather than spectacular, missed a great chance to equalise at the end. 6 Getty Images Manchester United vs Everton player ratings Aiden McGeady Didn't make much of an impact. 5 Getty Images Manchester United vs Everton player ratings Steven Naismith His great season continues and was a thorn in United's side. 7 Getty Images Manchester United vs Everton player ratings Steven Pienaar Classy backheel that led to penalty, but otherwise was fairly inconspicuous. 6 Getty Images Manchester United vs Everton player ratings Romelu Lukaku Struggled a little on his own up front, but kept going all game. 6 Getty Images

“Kick It Out is aware of footage of alleged racist chanting by supporters of Manchester United that emerged on Wednesday evening [September 13],” a Kick It Out spokesman said on Tuesday.

“The lyrics used in the chant are offensive and discriminatory. Racist stereotypes are never acceptable in football or wider society, irrespective of any intention to show support for a player.

“We have contacted Manchester United regarding the issue and will be working closely with them and the FA to ensure that it is addressed swiftly. If we receive any reports relating to the discriminatory chant, those will be passed on to the governing body and the perpetrators can expect to face punishment.”

A United spokesman did confirm that the club have a “zero-tolerance” policy towards racism.

The chant about Lukaku emerged during Sunday's 4-0 victory over Everton (Getty)

The issue was brought to light by fans on social media and influential blogs that claimed the chant, which follows the tune of the Stone Roses’ Made of Stone, was “drivel that belongs in the 1980s”.

Lukaku joined United in the summer from fellow Premier League club Everton in a £75m transfer, and he scored against his former club at the weekend in a 4-0 rout at Old Trafford that put United level at the top of the table with fierce rivals Manchester City. It was during the encounter that the song was heard by members of the United support, with video footage subsequently uploaded to social media to reveal the racial chant.

Premier League round-up: Manchester clubs win big

United’s desire to seek advice on the matter follows Chelsea’s decision to ban an anti-semitic song about striker Alvaro Morata. The Spain international asked fans not to sing a chant that he felt was racially abusive, and the club issued a statement earlier this month to confirm that anyone found singing the chant at Stamford Bridge will be prosecuted.

“We made an initial statement after the game and we are happy to repeat, but also make clear: Chelsea Football Club finds all forms of discrimination abhorrent and the language that was used in that song the other night we find totally unacceptable,” a Chelsea spokesman said following the game between the Blues and Leicester City on Saturday 9 September.

“People that use this kind of language against others always try to argue a grey area. There is no grey area. That language used was anti-Semitic.

“We have a zero tolerance policy towards it. If there is evidence that season ticket holders or members took part in that, and take part in it in the future, then we will take the strongest possible action against them, which includes bans.

Chelsea will take a 'zero-tolerance' policy against any racial abuse (Getty)

“People should know that the police will be investigating and they will investigate all future such episodes. And we will support the police in anything they need us to do, assist their enquiries, and we will also support criminal prosecutions of such behaviour and activity.