"The chanting last night by a vocal minority was wholly inappropriate and Chelsea Football Club does not condone such behavior," a spokesman said.
"We will be working with the appropriate authorities to seek out those responsible.
"Chelsea FC believes - as we are sure do the vast majority of our fans - that all forms of discrimination are abhorrent and have no place in our society.
"As a club, we work hard on educating our fans on these issues and will continue to do so.
"We work closely with the football authorities and anti-racism organisations and we are fully committed to eradicating racism and all other forms of discrimination from the game.
"Last night's offensive chants were from a minority and, as such, they do not represent what supporting Chelsea Football Club is all about."