Chelsea stopped three supporters from entering Thursday's Europa League match at Slavia Prague after they were identified singing a derogatory chant about Liverpool star Mohamed Salah, the club has confirmed.

Video of the fans singing "Salah is a bomber" in a Prague bar on Thursday circulated widely on social media, attracting widespread condemnation and prompting anti-discrimination body Kick It Out to call for action.

Three of the six men in the video were identified by Chelsea's away security team and denied access to Eden Arena in Prague. The other three are believed to have stayed away from the ground.

Club statement. https://t.co/tMqiV6H53Z

— Chelsea FC (@ChelseaFC) April 11, 2019

In a statement issued shortly after kick-off, the club pledged to take the "strongest possible action" against any season ticket holders found to have misbehaved.

"Chelsea FC finds all forms of discriminatory behaviour abhorrent and where there is clear evidence of Chelsea season ticket holders or members involved in such behaviour, we will take the strongest possible action against them," the statement read.

"Such individuals are an embarrassment to the vast majority of Chelsea supporters who won't tolerate them in their club."

Chelsea's season has been marred by a series of racist incidents. UEFA opened an investigation into allegations of anti-Semitic chanting by Blues supporters during a Europa League group stage match against Vidi in Budapest in December, though no disciplinary action was ultimately taken.

This episode is particularly damaging with Chelsea set to face Liverpool and Salah -- who spent two years on the books at Stamford Bridge -- in the Premier League at Anfield on Sunday, and the Merseyside giants issued a statement of their own in response to the video.

"The video circulating online, showing vile discriminatory chants being aimed at one of our players, is dangerous and disturbing," the statement said.

"Already this season, we have seen repulsive discriminatory abuse inside stadiums in England, Europe and across the world; abuse that was captured on devices and put into the public domain. We have also witnessed numerous hateful attacks on social media.

"This behaviour needs to be called out for what it is -- unadulterated bigotry.

"Liverpool Football Club believes it is the responsibility of those in positions of authority, following proper process, to act urgently to identify and then punish anyone committing a hate crime.

"There is no place for this behaviour in football, there is no place for it in society. A crime of this nature has more victims than any individual it is aimed at and, as such, collective and decisive action is needed to address it.

"As pertains to this latest incident, the club is working with Merseyside Police to ascertain the facts around this footage with the aim of identifying individuals featuring in it.

"In addition, we are working directly with Chelsea Football Club on the matter. We thank them for their condemnation and a commitment to act urgently to identify any individuals responsible."