He became the 845th player ever to play for the Arsenal when he came on at half time on Wednesday.
Dasilva told arsenal.com: "It was quite surprising, obviously the boss threw me on at half-time and it's just a good feeling to finally make my debut for Arsenal Football Club.
"It's a moment I've dreamt of since I've been here since I was nine, so ever since I've just been working towards this dream and I've achieved it. I'm just trying to push on and get more appearances for this great club.
"I came through Hale End and I'm a third year now so I was in the under-18s for two years and now I'm with the under-23s and getting to grips with first team football now. It's good, so I'm just trying to push on now."