Chelsea apologized on Friday to the man who was racially abused by their fans before a Champions League match and team manager Jose Mourinho spoke of his shame over the incident.
Supporters of the Premier League club were caught on camera preventing a black man, identified only as Souleymane, from boarding a metro train and chanting racist comments before the 1-1 draw at Paris St Germain on Tuesday.
"I would like to make clear on behalf of everyone at the club our disgust with regards to the incident that took place on the Paris subway on Tuesday evening," Chelsea communications director Steve Atkins said in a statement.
"We were appalled by what we saw. The club would also like to apologize unreservedly to Souleymane for the behavior of a small number of individuals and their unforgivable actions towards him."
Chelsea has invited Souleymane and his family to watch the last-16 return leg against PSG at Stamford Bridge next month.
"I think he would watch not only the game, but he would feel what Chelsea is," Mourinho told reporters.
"At this moment he will have the wrong idea of what Chelsea is. He would feel that the people who did this action with him is not Chelsea," the Portuguese added.
"We feel ashamed but maybe we shouldn't because I refuse to be connected with these people."
Mourinho said his multi-cultural squad was affected by the incident.