Sergio Agüero participant in 2019 Copa América
2018 World Cup, 2019 Copa América, and 2021 Copa América
On 14 November 2017, Agüero was taken to hospital after fainting in the dressing room at half-time in a 4–2 loss to Nigeria in a friendly match in Krasnodar, Russia.In May 2018, Agüero was named in Argentina's preliminary 35-man squad for the 2018 FIFA World Cup in Russia; later that month, he was included in Jorge Sampaoli's final 23-man squad for the competition. In his team's first group match of the tournament against Iceland on 16 June, he scored the opening goal of an eventual 1–1 draw; this was his first ever World Cup goal. In the round of 16 match against France on 30 June, Agüero scored Argentina's final goal in a 4–3 defeat, which saw his side eliminated from the World Cup.On 21 May 2019, he was included in Lionel Scaloni's final 23-man Argentina squad for the 2019 Copa América. In Argentina's final group match against Qatar on 23 June, Agüero scored the second goal in a 2–0 win, which enabled his team to advance to the knock-out stages. On 28 June, in the quarter-finals of the tournament, Agüero assisted Lautaro Martínez's opening goal, and was also involved in the second goal, scored by Giovani Lo Celso, as Argentina defeated Venezuela 2–0 to advance to the semi-finals. In the third-place match against Chile on 6 July, Agüero scored the opening goal in an eventual 2–1 win, to help Argentina capture the bronze medal.On 28 June 2021, Agüero made his 100th senior international appearance for Argentina in a 4–1 win against Bolivia in his team's final group stage match of the 2021 Copa América, also setting up Messi's second goal. Argentina eventually won the tournament.
During the 2022 FIFA World Cup, Agüero was present with the winning Argentine team for the duration of the tournament as an unofficial supporter, as his heart conditions had forced his retirement a year earlier. Though not an official member of the team, he was seen celebrating with the players after their win in the final.
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