Chelsea prevented three people from entering the stadium for Thursday’s Europa League quarter-final at Slavia Prague after a video appeared to show them singing an abusive song about Liverpool forward Mohamed Salah.
The group were apparently chanting “Salah is a bomber” repeatedly.
Liverpool said the video shows “vile discriminatory chants” and is “dangerous and disturbing”.
Three of the six people in the video were identified and barred.
Chelsea are working to identify the other three, who did not turn up.
The Stamford Bridge club, who are working with police and Liverpool, said the people concerned were an “embarrassment”.