Anton Artyomovich Efremov (; born 11 June 2003) is a Russian professional footballer who plays as a central defender for Spanish Primera Federación club Osasuna Promesas.
Efremov began at the DYuTs Sormovo municipal academy in the Sormovo City District of Nizhny Novgorod. In this subsidiary club of the FC Volga Nizhny Novgorod, his coach for 3 seasons was the Spanish José Luis Lorenzo Ortega, who sent reports to Villarreal where he reported the quality of the player. Despite the reports, Lokomotiv Moscow moved faster and signed the player where he spent 3 seasons.
In the 2019âÂÂ20 season, his first year as a youth, he remained on Villarreal training with Juvenil A but was unable to debut in the league due to bureaucratic delays with his visa in Spain. This tired the player who returned to Russia to play for the Chertanovo Moscow academy where he received the opportunity to debut in the Russian Football National League on 17 October 2020 in a game against Veles Moscow at only 17 years old, just started his youth stage. and another game in the Russian Cup, at just 17 years old, just beginning his youth stage.
In July 2021, Villarreal decided to make every effort to sign Antón Efremov, signing him as a property with a professional contract until 30 June 2024. After his signing, the Villarreal football department cataloged him as their new Pau Torres. In the 2022âÂÂ23 season, Efremov played his first season in senior football in Villarreal's second reserve team at the Tercera Federación.
On 30 August 2024, Efremov joined Sestao River in the third-tier Primera Federación on a season-long loan.
On 14 August 2025, Efremov moved to Osasuna on a one-year contract with two more optional additional years, for their reserve team Osasuna Promesas in Primera Federación.