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Inside Lionel Messi and Sergio Aguero's remarkable 16-year friendship as duo unite at Barcelona - Mirror Online
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Sergio Aguero on Lionel Messi relationship: "He always complains, we are like an old married couple" - Football España
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Barcelona: Lionel Messi and Sergio Aguero are best mates off the pitch... but what about on it? | Daily Mail Online
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Barça Worldwide on Twitter: "THREAD: Best friends Sergio Aguero and Lionel Messi will play together at club level for the very first time in their careers. However, it was a horrific tragedy
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