Further shame has been heaped on Chelsea by a minority of their fans. Days after the club banned four fans for allegedly racially abusing Raheem Sterling, their Europa League game away to Hungarian club Vidi was marred by anti-semitic chanting.
The chants were audible just minutes into last night's 2-2 draw, and the club responded by issuing a statement questioning the "brainpower" of these fans.
Anti-semitism and race-related hatred is abhorrent to this club and the overwhelming majority of our fans. It has no place at Chelsea.
We have stated this loud and clear on many occasions from the owner, the board, coaches and players. Any individuals that can't summon the brainpower to comprehend this simple message and are found to have shamed the club by used using anti-semitic or racist words or actions will face the strongest possible action from the club.
The very top of the club is understood to be furious about the chanting - owner Roman Abramovich is a Jewish man and has led numerous campaigns at the club to combat anti-semitism.
In October, it was revealed that Abramovich was at the forefront of an initiative to send fans chanting anti-semitic songs on educational trips to Auschwitz instead of issuing them banning orders.
UEFA will sait on the referee's report from the game before deciding to take any action.
The 2-2 draw sends Chelsea through to the last-32 of the Europa League as group winners.