West Ham have promised to hand lifetime bans to any individuals identified after footage circulated on social media showed fans singing sickening anti-semitic chants at a Jewish male.
The video, which has already been viewed more than 100,000 times, captures individuals on a plane chanting anti-semitic abuse toward a fellow passenger.
And in a statement to Mirror Sport, the club have reaffirmed their zero tolerance to any form of discrimination and promise to take action against anyone subsequently identified.
A West Ham United spokesperson said: "West Ham United is appalled by the contents of the video circulating on social media and condemn the behaviour of the individuals involved.
"The Club is liaising with the airline and relevant authorities to identify the individuals.
"We continue to be unequivocal in our stance - we have a zero-tolerance approach to any form of discrimination.
"Any individuals identified will be issued with an indefinite ban from the Club. Equality, diversity and inclusion are at the heart of the Football Club and we do not welcome any individuals who do not share those values."
The Hammers took on RC Genk in Belgium on Thursday night as the Premier League club continued their Europa League campaign.
The video shows fans singing anti-semitic chants to a Jewish male ( Image:
@AwayDayBible/Twitter)
Around 1,200 fans were in attendance at the Cegeka Arena to witness David Moyes' side draw 2-2 to all but seal qualification to the knockout stages.
The Premier League side recovered from conceding the opening goal after just five minutes to lead in the closing stages thanks to a Said Benrahma brace.
Tomas Soucek's late own goal meant the shares were spoiled, although the Hammers remain well placed to top the group.
However, the achievement will be marred by the repulsive footage which will put fan behaviour firmly back in the headlines.
Last month, manager David Moyes called on supporters to be on best behaviour with the eyes of Europe on them.
West Ham earned a 2-2 draw with Genk in Belgium
"We want to be welcomed all over Europe," said Moyes. "Not only to get into the tournaments but we want to be invited to the competitions or the pre-season tournaments that take place, whether they are in Germany or anywhere else.
"We want to be a club that people want to invite because of the football and because of the support.
"But I'll tell you another reason. My dad, my wife and my family are all going to travel to all the away games to support West Ham.
"My dad's eighty-odd and I want him to feel that he can go and have a few beers with the supporters. I want him to feel he can get to games and feel there's no problem.
"So wherever that is, that's the way we want it to be. As supporters who want to go and follow West Ham, we couldn't wait to hear the draw.
"Where were we going? Vienna, what other countries? Croatia, Zagreb. So we want to be going to enjoy the trip as well. We want to see the team win but we want to get a couple of days away and enjoy it.
"So we need everybody to be pulling in the right direction. We want to be the good West Ham."