Tonight sees us take on Real Madrid in competitive action for the first time in 19 years, but the links between the teams go much deeper than that.
A host of big name players have moved between the clubs down the years, and many others have spent time in both north London and the Spanish capital during their illustrious careers.
In total, nine players have turned out for both teams at some point, but can you name them all? You've got five minutes so be quick!
Once you're done, challenge your friends to see if they can better your score, and try out all our other Arsenal quizzes.
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