Diogo Casimiro da Silva Costa (born 14 December 1998) is a Portuguese professional footballer who plays as a right-back.
Football career On 3 November 2018, Casimiro made his debut for Braga B in a 2018–19 LigaPro match against Famalicão.
On 5 July 2023, Casimiro signed for Liga Portugal 2 side Oliveirense, his first youth club.
On 13 June 2025, Casimiro joined Portimonense on a one-season deal.
Personal life On 31 December 2020, Casimiro was diagnosed with Hodgkin lymphoma. While undergoing chemotherapy, an infection forced him into surgery and a four-day induced coma. He also underwent autologous stem-cell transplantation. Casimiro was able to make a full recovery, returning to training with Braga B in July 2022.
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