Arsenal have signed Borussia Dortmund defender Sokratis Papastathopoulos on a long-term contract for an undisclosed fee, the Premier League club announced on Monday.
Papastathopoulos, who has 79 caps for Greece, is new Arsenal boss Unai Emery's third major signing of the summer following goalkeeper Bernd Leno from Bayer Leverkusen and defender Stephan Lichtsteiner from Juventus.