"Technique, acceleration, unpredictability and talent... features that the green and gold talent will now make available to Juventus," Juventus said in a statement.
Costa, 26, spent five years at Ukrainian top-tier club Shakhtar Donetsk before joining the Bundesliga champions in 2015, making 23 league appearances last season and scoring four goals.
(Reporting by Silvia Recchimuzzi in Gdynia, editing by Ed Osmond)
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