Omeruo spent time on-loan with the Eredivisie club as he worked towards a European passport.
He told the Telegraph: "When I got signed by Chelsea I was loaned directly to Den Haag to improve my game. Their fans are passionate. Every player has a song the fans sing to boost you. The Den Haag fans shout my name and sing: 'He's here, he's there, he's every f****** where'."
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