Çağlar Söyüncü

Altınordu

Söyüncü began his senior professional career with Altınordu in the TFF First League, the second level of the Turkish football league system. During the 2015–16 season with Altınordu, Söyüncü was linked with Beşiktaş, Galatasaray and Sevilla, but he selected the Bundesliga because he thought it was better choice for his career and his improvement.

SC Freiburg

On 24 May 2016, in the 2016 Bundesliga summer transfer window, Söyüncü joined German side SC Freiburg, which was promoted to the top flight competition of Germany for the 2016–17 season. He is the first Turkish footballer who made a transfer to the Bundesliga directly from the TFF First League, the second-highest professional level football league of Turkey. He made his Bundesliga debut away against Hertha Berlin which ended in a 2–1 loss, on 28 August 2016. He was linked with Lille, Roma, and Villarreal during the mid-season transfer window of the 2016–17 season. Manchester City was also reported to be interested in Söyüncü.

Leicester City

On 9 August 2018, Söyüncü joined English Premier League side Leicester City on a five-year contract. He signed for an apparent £18 million transfer fee, possibly rising to £20 million with add-ons. Söyüncü had his Premier League debut on 27 October 2018 at the King Power Stadium where Leicester shared points with West Ham United following the final score of 1–1. Söyüncü scored his first Premier League goal in Leicester's 11th game of the 2019–20…

In November 2015, he was called up to Turkey national football team by coach Fatih Terim, following the injury of central defender Serdar Aziz. Söyüncü is the first Altınordu player called up to Turkey national football team after 78 years, since Sait Altınordu, the iconic player of the club, was selected in 1937. He is also the first player called up to national team from any İzmir-based football clubs since 1997. On 17 November 2015, Söyüncü was a reserve for the friendly game against Greece, but stayed on the bench and did not actually get a chance to play. On 18 March 2016, he was called to national squad for friendly games against Sweden and Austria, to be held on 24 March 2016 in Antalya, Turkey and on 29 March in Austria, respectively. Substituting for Ozan Tufan in the dying minutes of a friendly game against Sweden, Söyüncü earned his first senior national team cap on 24 March 2016. Earning his second cap, he was in the starting line-up in the friendly with Russia on 1 September 2016, which ended 0–0. On 1 June 2018, Söyüncü scored his first senior international goal on a friendly game against Tunisia, held at Stade de Genève, Geneva, Switzerland. On 1 June 2021, he was selected in the 26-man squad for the UEFA Euro 2020. On 24 May 2024, he was named in the 35-man preliminary squad for the UEFA Euro 2024. However, on 29 May, he was withdrawn due to injury. On 2 June 2026, Söyüncü was selected in the 26-man squad for the 2026 FIFA World Cup.

Possessing leadership attributes, Söyüncü is good at playmaking, dribbling and timing. Standing at 1.85 m (6 ft 1 in), he is strong in the air. In 2016, he stated that his idol is Spanish defender Carles Puyol and he admires German international Mats Hummels. Former English international and current pundit Martin Keown analysed Söyüncü for BBC Sport in 2019, describing him "a defender made for the modern game", highlighting his agility, aggressiveness and heading attributes.

Söyüncü is a longtime fan of Fenerbahçe since his childhood.