When David Luiz headed Arsenal ahead against Bournemouth on Sunday, he became the latest player to score a Premier League goal for Arsenal and Chelsea.
Luiz, who signed for the Gunners from their London neighbours for £8m in August, is the eighth man to achieve the feat.
But can you name the other seven? You have three minutes…
Can you name the players to score for both Arsenal and Chelsea in the Premier League?
Score: 0 / 7