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The 25-year-old put the finishing touches to the move on Saturday, with new Barca president Sando Rosell on hand to oversee proceedings.
Adriano has the option for a further 12 months on his deal should he impress sufficiently during his time in Catalunya.
Barcelona have revealed that they have paid an initial €9million (£7.6m) in order to land the player, with that figure set to rise to a possible €13.5million (£11.4m) should certain criteria be met.
Adriano, who has eight caps for Brazil to his name, leaves Sevilla after five years of loyal service.
