Costa training with Porto in 2018
|Full name||Diogo Meireles Costa|
|Date of birth||19 September 1999|
|Place of birth||Rothrist, Switzerland|
|Height||1.87 m (6 ft 2 in)|
* Senior club appearances and goals counted for the domestic league only and correct as of 10 November 2019|
‡ National team caps and goals correct as of 10 September 2019
Costa made his senior debut with the reserve team on 6 August 2017, in a 1–2 home loss against Gil Vicente F.C. for the LigaPro. He finished the season with a further 31 appearances, helping to a seventh-place finish.
On 15 May 2018, Costa renewed his contract until June 2022. In September, he was named the club's Newcomer of the Year; late in the same year, Spaniard Iker Casillas – who started for the first team – heaped praise upon him, regarding him as his "successor".
Costa won the 2018–19 UEFA Youth League with Porto, defeating Chelsea 3–1 in the final in Nyon, Switzerland on 29 April. Days later, after Casillas suffered a heart attack, Vaná replaced him as starting goalkeeper and Costa was called up to the bench for the final three games of the season, starting with a 4–0 win at C.D. Aves on 4 May.
In July 2018, Costa played four matches out of five at the UEFA European Under-19 Championship held in Finland, helping Portugal win the tournament for the first time ever but missing the final due to a muscle injury. Previously, on 25 May, the 18-year-old won his first cap for the under-21 side, coming on as a second-half substitute in a 3–2 friendly win over Italy.
- As of match played 5 December 2019
|Club||Season||League||National Cup||League Cup||Continental||Other||Total|
- Appearances in Premier League International Cup
- UEFA European Under-17 Championship: Team of the Tournament 2016
- UEFA European Under-19 Championship: Team of the Tournament 2017
- "Atleta revelação do ano: Diogo Costa" [Newcomer athlete of the year: Diogo Costa] (in Portuguese). FC Porto. 29 September 2018. Retrieved 31 December 2018.
- "COMENTÁRIO: Gil Vicente estreou-se com vitória em casa do FC Porto B" [COMMENT: Gil Vicente had winning debut at FC Porto B]. Diário de Notícias (in Portuguese). 6 August 2017. Retrieved 31 December 2018.
- "Diogo Costa prolonga contrato com o FC Porto até 2021/22" [Diogo Costa extends contract with FC Porto until 2021/22] (in Portuguese). SAPO. 15 May 2018. Retrieved 31 December 2018.
- Gouveia, Carlos (13 December 2018). "Casillas elege sucessor na baliza do FC Porto: "Vem aí um craque"" [Casillas chooses successor in goal of FC Porto: "A star is coming"]. O Jogo (in Portuguese). Retrieved 31 December 2018.
- Almeida, Isaura (29 April 2019). "FC Porto é campeão Europeu Sub-19" [FC Porto are Under-19 European champions]. Diário de Notícias (in Portuguese). Retrieved 1 May 2019.
- "Vaná será titular frente ao Desportivo das Aves, escreve jornal" [Vaná will be starter against Desportivo das Aves, newspaper writes] (in Portuguese). SAPO. 2 May 2019. Retrieved 22 August 2019.
- "Em noite de estreia pelo FC Porto, Diogo Costa recebeu bênção de Marchesín" [On the night of his debut for FC Porto, Diogo Costa received Marchesín's blessing]. O Jogo (in Portuguese). 26 September 2019. Retrieved 20 October 2019.
- Esteves, Adérito (30 July 2018). "Conheça os 20 (mais um) campeões europeus de sub-19" [Meet the 21 (plus one) under-19 European champions] (in Portuguese). Mais Futebol. Retrieved 31 December 2018.
- Pereira, David (27 July 2018). "Guarda-redes de Portugal falha final do Europeu sub-19" [Portugal goalkeeper misses under-19 European Championship final]. Diário de Notícias (in Portuguese). Retrieved 31 December 2018.
- "Seleção sub-21 de Portugal vence Itália em amigável disputado no Estoril" [Under-21 Portuguese national team beat Italy in friendly held in Estoril] (in Portuguese). SAPO. 25 May 2018. Retrieved 31 December 2018.
- Diogo Costa at Soccerway. Retrieved 25 December 2018.
- "Títulos é com eles. FC Porto B revalida Premier League International Cup" [Titles are their business. FC Porto B renew Premier League International Cup supremacy] (in Portuguese). Rádio Renascença. 8 May 2018. Retrieved 25 December 2018.
- "FC Porto sagra-se bicampeão de juniores" [FC Porto crowned back-to-back junior champions] (in Portuguese). Mais Futebol. 4 June 2016. Retrieved 1 May 2019.
- "Under-17 – Portugal prevail on penalties against Spain". UEFA. May 2016. Retrieved 17 July 2018.
- "Under-19 – Portugal win epic U19 EURO final". UEFA. July 2018. Retrieved 30 July 2018.
- "[Under-17] The UEFA technical team – Team of the Tournament". UEFA. Retrieved 17 April 2018.
- "[Under-19] The UEFA technical team – Team of the Tournament". UEFA. Retrieved 17 April 2018.
- "Presidente da República condecora seleção campeã europeia" [President of the Republic decorates European champions national team]. Record (in Portuguese). 12 November 2018. Retrieved 14 November 2018.