Before the first leg of our Champions League quarter-final with Porto we asked you to identify the players who had represented both clubs. Ahead of the second match, it's time to see how well you know them.
In that first quiz last week, you found 10 players who had featured at first-team level for both Chelsea and Porto. They are listed again below, but do you know which of them made the most appearances for Chelsea in all competitions?
There are some real Blues legends and trophy winners on the list, as well as a few who spent just a short spell of their career at Stamford Bridge. Can you tell which is which? Try our quiz and find out. Good luck!
If you fancy using that Chelsea knowledge to try to win some fantastic prizes, don't forget to enter the Play Predictor before the match.