Sokratis Papastathopoulos (; born 9 June 1988), also known mononymously as Sokratis, is a Greek former professional footballer who played as a centre-back.
Club career AEK Athens On 21 June 2005, Papastathopoulos joined AEK Athens from Apollon Petalidiou after being scouted by Toni Savevski. On 26 October 2005, he made his debut for AEK in a Greek Cup match against PAS Giannina, scoring in the seventh minute of the game to help lead AEK to a 3–0 win.
In January 2006, he was loaned to Beta Ethniki club Niki Volos for six months to gain first-team football experience. He made 15 appearances for Niki Volos.
During the 2006–07 Super League Greece, Papastathopoulos managed to make 14 appearances whilst competing against the likes of Bruno Cirillo, Traianos Dellas and Vangelis Moras. In AEK Athens' 2006–07 UEFA Champions League campaign, Papastathopoulos managed to play in three out of six group games. In these three games, AEK managed one win (the famous 1–0 victory over A.C. Milan, where he man-marked Filippo Inzaghi), one draw (the 2–2 away draw with Anderlecht) and one loss (the 3–1 away defeat to Lille). During the 2007–08 Super League Greece, he was a mainstay in AEK's defence, keeping out competition from Geraldo Alves. He also played in the 2007–08 Champions League campaign, and in a Super League match, he became AEK's youngest-ever captain (age 19) in a game against Athens' local rival Panathinaikos in 2008.
Genoa On 1 August 2008, Papastathopoulos agreed to transfer to Genoa of the Italian Serie A for €4 million. He also played a club friendly against Genoa on the same day.
He made his debut for Genoa on 27 September 2008 against Fiorentina, followed by a start against Ravenna in the Coppa Italia a few days later. His first goal for Genoa came on 5 October 2008 at home against Napoli. Genoa won the game 3–2, but Papastathopoulos was sent off in the 89th minute During the 2009–10 season, he managed to play in most games and gained a following.
AC Milan On 20 July 2010, the AC Milan website confirmed that Papastathopoulos had joined the team, after Genoa and Milan reached an agreement to transfer Papastathopoulos to the club for €14 million, with the following payment schedule: Gianmarco Zigoni (half of his registration rights, valued at €3.75 million), Nnamdi Oduamadi (half of his rights, valued at €3.5 million) and Rodney Strasser (half of his rights, valued at €2.25 million) in a co-ownership deal, plus €4.5 million. Papastathopoulos was the club's first arrival under new manager Massimiliano Allegri.
On 24 May 2011, Milan and Genoa executives Adriano Galliani and Enrico Preziosi, respectively, verbally agreed to settle the player ownerships (subject to player agreements) of Kevin-Prince Boateng, Alberto Paloschi, Marco Amelia and Giacomo Beretta. The deal entailed that Milan buy back Gianmarco Zigoni, Rodney Strasser and Nnamdi Oduamadi (all under original price), while Genoa buy back Papastathopoulos for €13 million, which effectively made the de facto loan cost for Milan €1 million.
Werder Bremen
On 21 July 2011, Papastathopoulos moved to the Germany club Werder Bremen on a loan deal until the end of the 2011–12 season, with the option to purchase outright. Following impressive performances on loan, on 16 April 2012, it was announced that Papastathopoulos would join Bremen on a permanent basis for a €5 million transfer fee. The 2012–13 season, however, was not a good one for the club. In March 2013, in the midst of a relegation battle and with tensions high, Papastathopoulos engaged in a training ground brawl with teammate Marko Arnautović. Bremen would ultimately finish the year in 14th, staving-off relegation.
Borussia Dortmund On 24 May 2013, the eve of the 2013 Champions League Final between Bayern Munich and Borussia Dortmund, Papastathopoulos completed a €9.5 million transfer to Dortmund, agreeing to a five-year contract through to 2018. Upon signing, he spoke about the deal, saying, "Money did not play a role in my decision to join Dortmund. My own future was all that mattered and I am convinced that I made the right decision." With centre-back Felipe Santana departing Dortmund for Schalke 04, Papastathopoulos began as the effective third-choice behind tandem Neven Subotić and Mats Hummels. Borussia Dortmund Sporting Director Michael Zorc expressed his satisfaction with the deal: "We are delighted that Sokratis has decided to join Borussia Dortmund. He is a flexible player capable to play in a variety of positions in defence who we believe has tremendous potential."
On 10 July 2013, Papastathopoulos made his debut for Dortmund in a pre-season friendly away to Swiss club Basel at St. Jakob-Park, along with fellow BVB debutants (and future Arsenal teammates) Pierre-Emerick Aubameyang and Henrikh Mkhitaryan. On 27 July, he won his first title with the club after entering the match as a substitute in a 4–2 win over Bayern Munich for the 2013 DFL-Supercup. On 1 November 2013, he scored his debut goal for Dortmund in a win over VfB Stuttgart in the Bundesliga, 6–1.
Papastathopoulos' strong first year with Dortmund was rewarded with his selection to the best XI of the 2013–14 Bundesliga campaign. The selection was organised in a worldwide fan vote by the governing body of the Bundesliga through its official website. The description of his play following his nomination was, "The definition of defense falls on him. The Greek stopper took advantage of the opportunities given to him by the absence of Neven Subotić and Mats Hummels. Stable, with leadership characteristics and tendency to win the ball without making easily a mistake."
In November 2014, Papastathopoulos was out of action for two weeks diagnosed with a broken fibula. He suffered the injury to his right leg in Dortmund's 1–0 win over Borussia Mönchengladbach, a result that ended a five-match Bundesliga losing streak for the club. After an early recovery, he was deemed fit for BVB's Champions League match against Arsenal on 26 November. On 3 January 2015, football news website Goal.com assessed statistics to determine which players maintained the highest tackle success rate in the first half of the 2014–15 season across Europe's top five leagues; Papastathopoulos finished joint-third, alongside Hamburger SV's Matthias Ostrzolek, having won 92.59 per cent of all tackles.
In the summer of 2015, Papastathopoulos was linked with moves to various English Premier League clubs as Dortmund prepared for a new start following long-time manager Jürgen Klopp's departure. Dortmund Sporting Director Michael Zorc, however, said Papastathopoulos would still have a part to play for BVB in new manager Thomas Tuchel's debut season with the club. On 26 October 2015, Papastathopoulos extended his contract with Borussia Dortmund until 2019. After the extension, Zorc said, "We are very pleased that we have been able to sign with Sokratis, another top performer, on a long term." During Tuchel's tenure, Papastathopoulos was promoted to be partner-in-chief to Mats Hummels over Neven Subotic.
On 19 December 2015, Papastathopoulos scored his first goal in the 2015–16 Bundesliga in an eventual 2–1 away loss to 1. FC Köln, giving his club the lead in the first-half from a header from a corner. On 30 January 2016, in a league game against Ingolstadt 04, Papastathopoulos reached his 100th Bundesliga appearance with Dortmund. On 22 February 2016, Papastathopoulos missed the second leg of the UEFA Europa League round-of-32 tie against FC Porto and the Bundesliga clash with Bayern Munich due to an adductor injury, as tests confirmed that the 27-year-old would be out for up to three weeks. The Greek centre back picked up the injury during Dortmund's 1–0 win against Bayer Leverkusen and was replaced 13 minutes from time at the BayArena. On 21 May 2016, Papastathopoulos featured in his third DFB-Pokal final in a row, putting in a tremendous performance despite a missed penalty, but he did not succeed in winning the DFB-Pokal for first time in his career.
He started the 2016–17 season as the undisputed leader in BVB defence. On 15 September 2016, he netted the second goal in an away crashing 6–0 against Legia Warsaw on a Group UEFA Champions League match. On 4 January 2017, the German magazine "kicker" listed the Greek international as one of the best players in the German Bundesliga. The magazine paid a tribute to the best players currently playing in the German Bundesliga, separating them out into different categories. In the first category (World Class) no defenders were listed, however, Papastathopoulos was one of three defenders listed in the second category, International Class. The other two defenders included Mats Hummels of Bayern Munich and Jonathan Tah of Bayer Leverkusen.
On 8 February 2017, in a DFB-Pokal home win on penalties' game against Hertha Berlin, Papastathopoulos' two quickfire (in a minute) bookings for dissent saw Dortmund finish extra time with 10 men before Fabian Lustenberger, Vladimír Darida and Salomon Kalou all missed from the spot, rendering Christian Pulisic's miss irrelevant. On 25 February 2017, Dortmund made three changes from last weekend's 3–0 win over VfL Wolfsburg and it was two of those, Papastathopoulos and Raphaël Guerreiro, who combined to open the scoring in the 13th minute in a 3–0 away win against SC Freiburg. Papastathopoulos looked to be offside as Guerreiro swung in a free-kick from the right, which the Greece defender met with a header planted inside the right-hand post. On 16 April 2017, Papastathopoulos was the one who had a quick reaction to an Eintracht Frankfurt equalising, by scoring a goal after Sven Bender's assist giving a lead to the score in his team in a final 3–1 home win. On 26 April 2017, helped Borussia Dortmund to a 3–2 win over Bayern Munich and their fourth consecutive DFB-Pokal final. On 20 May 2017, Papastathopoulos reached 100 appearances with Dortmund in Bundesliga in a home game against Werder Bremen and secured automatic qualification to the group stage of next season's UEFA Champions League. On 27 May 2017, in his fourth DFB-Pokal final in a row, Borussia Dortmund claimed a first DFB-Pokal win since 2012 as Pierre-Emerick Aubameyang's penalty defeated Eintracht Frankfurt 2–1.
On 5 August 2017, as the captain of the club, he lost the 2017 DFL-Supercup on penalties' game against Bayern Munich. On 17 September 2017, he scored at the end of the first half against 1. FC Köln, giving a lead of two goals in his club. It was his first goal for the 2017–18 season and was secured with the use of VAR (Video Assistant Referee) method. On 14 October 2017, Borussia Dortmund's unbeaten start to the season was ended by RB Leipzig's 3–2 away win, as the Greek defender initially in trying to push the ball away helped Leipzig winger Yussuf Poulsen to score, while at the beginning of second half, was sent off for a foul in the box and Jean-Kévin Augustin scored the penalty. On 17 October 2017, after losing its UEFA Champions League opening games in Group H to Tottenham Hotspur and Real Madrid, Dortmund needed a win to kick-start its campaign in Europe's premier club competition, but they succeeded only to seal an away draw against Cypriot champions APOEL, as the Greek defender equalised with a header to Mario Götze's cross. On 4 November 2017, in the derby against rivals Bayern Munich he suffered a leg injury, during the first half, and was substituted by Jeremy Toljan, and two weeks later in an away game against VfB Stuttgart has received a heavy blow and replaced at the end of the first half from Dan-Axel Zagadou.
Arsenal