Europe's governing soccer body, the English Football Association and Chelsea officials condemned racially motivated attacks by the squad's fans after they were shown on videotape preventing a black man from boarding a subway train in Paris.
The incident happened before Chelsea played Paris Saint-Germain in the Champions League knockout stage on Tuesday.
The Guardian posted a video on its website showing fans reportedly shoving the man back after he tried to board a train at the Richelieu–Drouot station.
Paris authorities are investigating the incident.
According to the newspaper, the group started to chant "Chelsea, Chelsea, Chelsea" and "we're racist, we're racist, and that's the way we like it," after pushing and preventing the man from boarding.
UEFA condemned the incident but said it is out of their jurisdiction to impose any punishment.
"We are appalled by the incident which took place in the Paris Metro on Tuesday," UEFA said in a statement. "However, as it occurred away from the stadium, it is outside UEFA's remit to act."
The Football Association and FIFA president Sepp Blatter also weighed in on the incident. Blatter said "there is no place for racism in football " and FA said in a statement that "those responsible should face the strongest possible punishment."
Chelsea said that they "support any criminal action against those involved" and added that if found that a season-ticket holders were involved, they will take action, including banning future orders.
- Scooby Axson