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Sokratis Papastathopoulos, commonly known as Sokratis, is a Greek professional footballer who plays as a centre-back. He began his career with AEK Athens, where he won the Greek Cup in 2011. He then moved to Genoa, before joining Borussia Dortmund in 2013. With Dortmund, he won the DFB-Pokal in 2017 and the DFL-Supercup in 2014 and 2019. In 2018, he joined Arsenal, where he made 69 appearances in all competitions.