Fábio Vieira

Vieira played all five matches as Portugal finished runners-up to Spain at the 2019 UEFA European Under-19 Championship in Armenia. In the group phase against the same team on 17 July, he earned a 1–1 draw with a free kick in Yerevan; he and teammate Félix Correia were named in the Team of the Tournament. On 14 November 2019, Vieira won his first cap for the under-21 side, being booked in the 0–0 friendly home draw with Slovenia. Five days later, he scored once and provided one assist in a 3–2 victory in Norway in the 2021 UEFA European Championship qualifiers. He was voted best player of the finals in Hungary and Slovenia, featuring in all six games and netting once for the runners-up. In October 2022, Vieira was named in a preliminary 55-man squad for the 2022 FIFA World Cup in Qatar. Having scored seven goals during qualification, he missed the 2023 European Under-21 Championship due to injury.

As of match played 24 October 2026

Porto

Born in Santa Maria da Feira, Aveiro District, Vieira played nine matches as Porto's juniors won the 2018–19 UEFA Youth League, and scored to open their 3–1 win against Chelsea in the final in Nyon on 29 April. On 24 October 2018, in a group game, he was sent off for two yellow cards in a 2–1 loss at Lokomotiv Moscow. Vieira made his senior debut with Porto B on 24 February 2019, coming on as a 57th-minute substitute for João Mário in a 1–0 away defeat to Arouca in the LigaPro. Six months and a day later, he scored for the first time with a penalty in a 3–1 away victory over Farense. Vieira played his first competitive match with the first team on 10 June 2020, featuring 19 minutes in the 1–0 Primeira Liga home defeat of Marítimo. Again from the bench, he scored his first goal in the competition on 5 July to help the hosts beat B-SAD 5–0, and totalled eight appearances at the end of the season for the eventual champions. On 27 October 2020, in only his second appearance in the UEFA Champions League, Vieira netted in the 2–0 win against Olympiacos in the group stage after starting at the Estádio do Dragão. On 20 March 2022, his 32nd-minute strike decided the local derby at Boavista. He scored his first league brace two weeks later, his side's first and second goals in a 3–0 home win over Santa Clara. Vieira found more space within the first team during the 2021–22 campaign, especially after impressing in the 2021 UEFA European Under-21 Championship where he was…

In June 2023, Vieira announced he was expecting his first child with his partner Carina Raquel. Their son was born in October that year.