Rentistas Araújo joined
Rentistas from hometown club Huracán de Rivera. He made his senior debut with the former on 24 September 2016, coming on as a late
substitute in a 1–0
Segunda División away win against
Tacuarembó. Araújo scored his first senior goal on 9 December 2016, netting the equaliser in a 2–2 home draw against
Central Español. He became a regular starter during the 2017 season, and scored a
hat-trick in a 3–2 away win over
Villa Española on 17 June of that year. It was at Rentistas that Araújo made the significant switch in position from forward to defender.
Boston River On 28 July 2017, Araújo joined
Primera División side
Boston River. He made his debut in the category on 18 September, replacing
Maximiliano Sigales late into a 1–0 home success over
El Tanque Sisley.
Barcelona On 29 August 2018, Araújo signed a five-year contract with
La Liga club
Barcelona for a fee of
€1.7 million, plus €3.5 million in variables; he was initially assigned to
the reserves in
Segunda División B. He made his first team – and
La Liga – debut on 6 October of the following year, coming off the bench to replace
Jean-Clair Todibo in the 73rd minute of a 4–0 home win against
Sevilla; however, he was sent off in the 86th minute for fouling
Javier Hernández. For the
2020–21 season, Araújo was promoted to the main squad, being handed the number 4 jersey, which was previously worn by
Ivan Rakitić. On 19 December 2020, he scored his first
La Liga goal for Barcelona in a 2–2 home draw against
Valencia. On 20 March 2022, Araújo scored his first goal in
El Clásico, heading in a corner from
Ousmane Dembélé in a 4–0 away victory against the league leaders at
Santiago Bernabéu. For the first 21 league games of the
2022–23 season, Araújo formed a defensive partnership alongside
Andreas Christensen and occasionally
Jules Koundé at centre-back, helping Barcelona keep the most clean sheets (16) in all of
Europe's top 5 leagues. in 2023 On 21 July 2023, Barcelona announced Araújo as the club's third captain. On 4 November 2023, he scored his first goal of the
2023–24 season in the 92nd minute of stoppage time in a 1–0 away win over
Real Sociedad. On 16 April 2024, Araújo received a straight red card for fouling
Bradley Barcola in the first-half of Barcelona's Champions League quarter-final second leg match against
Paris Saint-Germain which shifted the momentum in PSG's favor, turning the tide of the match despite Barcelona's two goal lead and eventually ended up losing 4–1 on the night, and 6–4 on aggregate. On 23 January 2025, he extended his contract with the club until 2031. On 18 October 2025, in a La Liga match against
Girona, Araújo came on as a substitute
Marc Casadó in the second-half and scored the winning goal in a 2–1 home win in stoppage time. On 25 November 2025, Araújo was heavily criticized during a UEFA Champions League away fixture against
Chelsea. He had earned a yellow card in the 32nd minute and then just 12 minutes later Araújo fouled defender
Marc Cucurella in which the referee gave Araújo a second yellow card and was sent-off before the end of the first-half. Barcelona would go on to lose the match 3–0 in which many pundits and sports journalists blamed Araújo for disrupting the flow of the match. ==International career==