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The 16-year-old left-back is moving to north London after snubbing a professional contract at Barcelona.
He’s now changed his Instagram bio to: ‘Football Player Arsenal FC’.
Last week Lopez confirmed his departure from the Nou Camp.
He wrote: “The day has come to say goodbye to what has been my home these last seven years.
“Thanks to FC Barcelona, it will be the club that I always carry in my heart for wonderful moments that I have lived with my companions, physios, coaches, delegates, executives. Magnificent people who have made me feel welcome from the first day.
“It was a difficult decision but after contemplating it with my family I made the decision to go and start a new stage as a footballer with great enthusiasm.
“Thanks to all who have been there always. Visca Barca!”
Arsenal need to give Barcelona training compensation.
The Premier League heavyweights aren’t afraid to raid Barcelona in search of top talent.
Cesc Fabregas made a major impact in north London before returning to the Nou Camp.
Another ex-Catalan, Hector Bellerin, is currently Arsenal’s first-choice right-back.
Fran Merida, Ignasi Miquel and Jon Toral also joined Arsenal from Barcelona but failed to establish themselves.