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The Catalan giants announced that a deal had been agreed with Sao Paulo for the 24-year-old's services on Wednesday.
Douglas has now completed his medical and penned terms at Camp Nou until 2019.
Barca have paid an initial €4 million to the Brazilian side, with an extra €1.5 million due dependant on appearances.
"After a busy day which included his medical...the Brazilian came to the club offices this evening to [put] pen to paper on the five year deal worth 4 million Euros, with a further 1.5 million depending on the number of games he plays," read a statement on Barca's official website.
He will provide direct competition at full-back for compatriot Dani Alves.
