On every date between now and Christmas, we will bring you a quick quiz on a famous player or players who have worn that number on the back of their shirts for Chelsea.

There has been no shortage of defensive brilliance in the no.6 shirt at Stamford Bridge, and today's quiz features past and present Blues greats in the form of Marcel Desailly, Steve Clarke, Frank Sinclair, Ricardo Carvalho and Thiago Silva.

That's quite some list of number fours, so try our quiz and find out how well you know them. Just like with an advent calendar, you can come back and open a new quiz every day until Christmas Day. Unfortunately we can’t give you all a chocolate to enjoy with your quiz, but feel free to treat yourself if you score high. Good luck and merry quiz-mas!