Olympiacos F.C. (Greek: ΠΑΕ Ολυμπιακός), also known simply as Olympiacos, Olympiacos Piraeus or with its full name Olympiacos C.F.P. (Greek: Oλυμπιακός Σύνδεσμος Φιλάθλων Πειραιώς, transliterated "Olympiacos Syndesmos Filathlon Piraios"), Olympiacos Club of Fans of Piraeus, is a Greek association football club, part of Olympiacos CFP, based in Piraeus.

Olympiacos is the most successful club in Greek football history, having won 39 League titles, 25 Greek Cups and 4 Greek Super Cups, more titles than any other Greek team and it is one of four teams that have never been relegated from the first division; in European competitions, they have reached the quarter-finals twice, in the 1998–99 UEFA Champions League and the 1992–93 European Cup Winners' Cup. Olympiacos is also one of the founding members of the European Club Association.

The club's stadium is the Karaiskakis Stadium in Piraeus. Olympiacos is the most popular Greek club with around two and a half million fans in Greece and was placed ninth on the list with the most paid up members in the world in 2006, having 83,000 registered members as of April 2006. They share a great and long-standing rivalry with Panathinaikos, with whom they contest the derby of the eternal enemies.

David de Gea Quintana (Spanish pronunciation: [daˈβið ðe ˈxea]; born 7 November 1990) is a Spanish footballer who plays for Manchester United as a goalkeeper. Born in Madrid, he started his career aged 10 with Atlético Madrid and rose through the academy system at the club before making his senior debut in 2009. After being made Atlético's first-choice goalkeeper, he helped the team win both the UEFA Europa League and the UEFA Super Cup, and his performances attracted the attention of Manchester United, whom he joined in June 2011. He is also the current captain for the Spain U21 national side.

De Gea joined Atlético Madrid's youth system at the age of 10, and made his way up through the ranks at the club. He spent his first professional seasons playing for Atlético Madrid B in Segunda División B. With first-choice goalkeeper Sergio Asenjo away on international duty at the 2009 FIFA U-20 World Cup, De Gea was called up to the senior side as cover for Roberto. He made his debut for the Atlético first-team at the age of 18 on 30 September 2009, coming on as a substitute after Roberto was injured after 27 minutes of Atlético's UEFA Champions League group stage match away to Porto; De Gea conceded two late goals as Atlético lost 2–0.