Cristhian Mosquera

Valencia

Mosquera joined Valencia CF's youth setup in 2016, aged 12. On 22 August 2020, while still in the Juvenil A squad, he renewed his contract with the club until 2023. He made his senior debut with the reserves on 4 September 2021, starting in a 3–1 Tercera División RFEF home win over CD Castellón B. Having already featured on the bench for a few Liga fixtures that season, he made his first team debut on 16 January 2022, starting in a 1–0 away win over CD Atlético Baleares, for the season's Copa del Rey. Playing every minute of the game in the center of a three-man defense, his coach José Bordalás praised him as the best on the field that night. At the age of 17 years, six months and 23 days, he became the eight-youngest player in the club's history, and the youngest centre-back. Set to further renew his contract with the Che until 2025, Mosquera made his La Liga debut on 19 January 2022 by starting in a 1–1 draw against Sevilla, again impressing in the axis of the defense for what was a difficult game against the likes of Rafa Mir. This made him the fourth-youngest footballer to ever play in La Liga with Los murciélagos, surpassing the records set by Ferran Torres, Lee Kang-in and Yunus Musah. In August 2023, Mosquera was definitely promoted to the main squad of the Che. On 9 February 2025, he netted his first career goal in a 2–0 win over Leganés in La Liga.

Arsenal

On 24 July 2025, Mosquera joined Premier League club Arsenal on a long-term contract…

Mosquera represented Spain at under-15, under-16 and under-18 levels, winning a friendly tournament with the latter in October 2021, against Turkey, Romania and Portugal. He also holds a Colombian passport, which made him eligible to play for Los Cafeteros as well as Spain. On 27 March 2026, Mosquera made his senior Spain debut against Serbia in a friendly match.

Mainly playing as a centre-back during his time at Valencia's academy, Mosquera can also play as a full-back on both sides. When he made the switch from futsal to association football as a youngster, he actually played as a winger, where he first showed his athletic abilities. Mosquera was known for his strong physical presence at a young age, as well as being noted for his speed, anticipation and ability to play the ball as a defender, helping his teams move forward. Miguel Ángel Angulo – his coach at Valencia Mestalla – described Mosquera's profile as characterized by his "physical condition and good technical qualities".

Born in Alicante, Valencian Community to Colombian parents, Mosquera first played basketball in his hometown, before joining futsal team San Blas Cañavate, as his cousin was playing there and they were missing a player for a youth tournament. Having later moved to play in Carolines Altes-based team SCD Carolinas, he eventually joined the city main football club, Hércules CF. Cristhian has a younger brother named Yulian Mosquera, born in 2011, who plays for Valencia's Academy and Spain U15s, and is considered a talented prospect in Spain. When Cristhian signed with Arsenal, club manager Mikel Arteta jokingly made Yulian take a photo with a mock Arsenal contract.