Arsenal Dasilva began his career with
Arsenal and joined the club's
Hale End academy at the age of eight. He progressed through the ranks and moved from
left wing to
forward, before settling into a
box-to-box midfield role, under the guidance of
Thierry Henry and
Kwame Ampadu. After scoring 28 goals during the first year of his scholarship, Dasilva failed to see a pathway into the first team squad turned down a new contract at the end of the 2017–18 season. he made his debut as a substitute for
Josh McEachran late in a 2–0 win over
Millwall on 3 November 2018. which secured a 1–1 draw. scoring six goals in a 10-match spell, which included the first
hat-trick of his career in a 7–0 win over
Luton Town on 30 November. By the time Brentford's season ended with defeat in the
2020 Championship play-off final, Dasilva had made 47 appearances and scored 10 goals. His performance and goal in a 1–0 EFL Cup quarter-final victory over
Premier League club
Newcastle United on 22 December was recognised with a place in the EFL Cup Team of the Round. In the following round versus
Tottenham Hotspur, Dasilva was
sent off for the first time in his senior career after receiving a straight red card for a challenge on
Pierre-Emile Højbjerg. By the time his season was ended by a hip injury in late February 2021, Dasilva had made 35 appearances and scored seven goals.
2021–22 season Having spent four of the previous six months on crutches, After the window
transfer window closed, he was named in the club's updated 25-man Premier League squad. Following two
behind closed doors friendly appearances, Dasilva made his first competitive appearance of the season as a substitute for
Mads Roerslev after 72 minutes of a 4–1 FA Cup fourth round defeat to
Everton on 5 February 2022. He played the remainder of the season in a substitute role and ended the campaign with 10 appearances. Dasilva's 39 appearances was his highest tally since the 2019–20 season, who admitted he "got emotional just thinking about it. (Dasilva's) been out for 18 months; almost a year, then a setback and another setback".
2024–2026 Following his first appearance of the
2023–24 season, in Brentford's second match of the campaign, He returned to match play with a start in a 1–1 FA Cup third round draw with
Wolverhampton Wanderers on 5 January 2024. for which he underwent surgery. On 17 May 2024, it was announced that Dasilva had signed a new one-year contract, with the option of a further year. Dasilva underwent two further operations and missed the entire
2024–25 season. On 23 October 2025, Dasilva signed a new contract, running until the end of the 2025–26 season, with the option of a further year attached. By February 2026, Dasilva had returned to "modified" training with the first team squad. On 2 May 2026, he made his first appearance since 31 January 2024, == International career ==