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 13 April 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".
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 9 March 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.
- 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.
- "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.
- 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.
- "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.
- "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.