There's been quite a bit of crossover between Chelsea and Barcelona over the years.
The first player to play for both teams did so 23 years ago and there have been 12 others since.
Given that Chelsea are hosting Barca in the Champions League this week, we felt it would be fitting to test your knowledge.
We've already given you one freebie via the featured image above but the rest is on you.
We'd be absolutely shocked if anyone gets all 13 but let us know how you do.
Best of luck...
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