The 24-year-old - who has agreed a four-year deal after passing a medical - was born in Brazil, but having moved to Europe at the age of 15, he took Croatian nationality in 2002.
He told the club´s official website, www.arsenal.com: "I am so happy and proud to be joining Arsenal Football Club. Arsenal is one of the biggest clubs in the world with many great players and I am looking forward to helping my new club challenge for trophies."
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