Tomás Alarcón

O'Higgins

Born in Rancagua, Alarcón began his career with hometown side O'Higgins. He made his first team debut at the age of just 17 on 13 August 2016, starting in a 1–1 away draw against Deportes Iquique. Alarcón started to establish himself as a starter for the club midway through the 2018 campaign, where he was also utilised as a central defender by manager Gabriel Milito. He scored his first senior goal on 13 September 2020, but in a 2–1 home loss against Everton de Viña del Mar. On 8 December, he scored a brace in a 2–1 home success over Huachipato. Alarcón finished the 2020 season with seven goals scored in 28 games.

Cádiz

On 13 June 2021, Alarcón signed a four-year contract with La Liga club Cádiz CF, which spent $2 million for the 80% of his pass. On 14 August, he made his official debut with Cádiz on the first match of 2021–22 La Liga, playing from the start in the 1–1 draw against Levante and sending a key cross for the equalizer at the end of his debut match. On 27 December 2022, after being rarely used during the campaign, Alarcón was loaned to Segunda División side Real Zaragoza until June. On 23 August 2023, he moved to fellow second division side FC Cartagena on loan for the 2023–24 season. Back to Cádiz in July 2024, Alarcón again featured rarely before moving to Colo-Colo back in his home country on 22 January 2025.

At under-20 level, Alarcón represented Chile in both the 2018 South American Games, winning the gold medal, and the 2019 South American Championship He also represented Chile U23 at the 2020 CONMEBOL Pre-Olympic Tournament and was in the Chile U23 squad for the 2019 Toulon Tournament. Alarcón made his debut for Chile senior team on 5 September 2019 in a friendly match against Argentina, as a 55th-minute substitute for Claudio Baeza. He was considered by Martín Lasarte to play in the 2022 FIFA World Cup qualification, having his first official international presentation against Argentina on 3 June 2021. In the same month, Alarcón was nominated to participate in the 2021 Copa América, playing in four games of the tournament, in which Chile lost at the quarter-finals against Brazil.

Club

As of match played 10 December 2023

International

As of match played 14 June 2022

Chile U20

South American Games Gold medal: 2018